From db23e4c9c1921f43d57166db776d95537b227a44 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jul 2020 23:19:26 +0000
Subject: [PATCH 001/123] build(deps): bump lodash from 4.17.15 to 4.17.19

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.15...4.17.19)

Signed-off-by: dependabot[bot] <support@github.com>
---
 package-lock.json | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 896253b..bc1165e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -812,9 +812,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.15",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
-      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A=="
+      "version": "4.17.19",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.19.tgz",
+      "integrity": "sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ=="
     },
     "log-symbols": {
       "version": "3.0.0",

From e793217e29835b2ec73303a9c41e30228b3d3e7f Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 2 Aug 2020 16:23:14 +0800
Subject: [PATCH 002/123] =?UTF-8?q?docs(types/function):=20edit=20?=
 =?UTF-8?q?=E5=87=BD=E6=95=B0=E5=AE=9A=E4=B9=89=E5=90=8E=E9=9D=A2=E7=9A=84?=
 =?UTF-8?q?=E5=9C=86=E6=8B=AC=E5=8F=B7?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/types/function.md | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index 66265d9..70c41ee 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -790,7 +790,7 @@ p1.getAge() // 25
 
 ### 立即调用的函数表达式（IIFE）
 
-在 JavaScript 中，圆括号`()`是一种运算符，跟在函数名之后，表示调用该函数。比如，`print()`就表示调用`print`函数。
+根据 JavaScript 的语法，圆括号`()`跟在函数名之后，表示调用该函数。比如，`print()`就表示调用`print`函数。
 
 有时，我们需要在定义函数之后，立即调用该函数。这时，你不能在函数的定义之后加上圆括号，这会产生语法错误。
 
@@ -809,7 +809,16 @@ function f() {}
 var f = function f() {}
 ```
 
-为了避免解析上的歧义，JavaScript 引擎规定，如果`function`关键字出现在行首，一律解释成语句。因此，JavaScript 引擎看到行首是`function`关键字之后，认为这一段都是函数的定义，不应该以圆括号结尾，所以就报错了。
+当作表达式时，函数可以定义后直接加圆括号调用。
+
+```javascript
+var f = function f(){ return 1}();
+f // 1
+```
+
+上面的代码中，函数定义后直接加圆括号调用，没有报错。原因就是`function`作为表达式，引擎就把函数定义当作一个值。这种情况下，就不会报错
+
+为了避免解析的歧义，JavaScript 规定，如果`function`关键字出现在行首，一律解释成语句。因此，引擎看到行首是`function`关键字之后，认为这一段都是函数的定义，不应该以圆括号结尾，所以就报错了。
 
 解决方法就是不要让`function`出现在行首，让引擎将其理解成一个表达式。最简单的处理，就是将其放在一个圆括号里面。
 

From 7cb09b2ea9946635c3ac8a620e1d1aad327f83c2 Mon Sep 17 00:00:00 2001
From: Lean You <7764115+byog@users.noreply.github.com>
Date: Tue, 4 Aug 2020 15:42:53 +0800
Subject: [PATCH 003/123] Update math.md
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

不全 Math.floor() 和 Math.ceil() 信息
---
 docs/stdlib/math.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/stdlib/math.md b/docs/stdlib/math.md
index a36cd38..a5e8947 100644
--- a/docs/stdlib/math.md
+++ b/docs/stdlib/math.md
@@ -66,14 +66,14 @@ Math.max() // -Infinity
 
 ### Math.floor()，Math.ceil()
 
-`Math.floor`方法返回小于参数值的最大整数（地板值）。
+`Math.floor`方法返回小于或等于参数值的最大整数（地板值）。
 
 ```javascript
 Math.floor(3.2) // 3
 Math.floor(-3.2) // -4
 ```
 
-`Math.ceil`方法返回大于参数值的最小整数（天花板值）。
+`Math.ceil`方法返回大于或等于参数值的最小整数（天花板值）。
 
 ```javascript
 Math.ceil(3.2) // 4

From d0ae41cbc4435f9b3ffd885116760cbfe966e88b Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Mon, 24 Aug 2020 23:43:15 +0800
Subject: [PATCH 004/123] docs(stdlib/regex): fix typo

---
 docs/stdlib/regexp.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/stdlib/regexp.md b/docs/stdlib/regexp.md
index 4d7fecb..8e306e0 100644
--- a/docs/stdlib/regexp.md
+++ b/docs/stdlib/regexp.md
@@ -485,7 +485,7 @@ str.split(separator, [limit])
 
 上面代码指的是，`a`和`b`之间有一个空格或者一个制表符。
 
-其他的元字符还包括`\`、`\*`、`+`、`?`、`()`、`[]`、`{}`等，将在下文解释。
+其他的元字符还包括`\`、`*`、`+`、`?`、`()`、`[]`、`{}`等，将在下文解释。
 
 ### 转义符
 

From a2aed617b96b8c5b75ab319a15bd327564687dd1 Mon Sep 17 00:00:00 2001
From: Lean You <7764115+byog@users.noreply.github.com>
Date: Wed, 26 Aug 2020 16:51:55 +0800
Subject: [PATCH 005/123] fix: typo

---
 docs/events/drag.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/events/drag.md b/docs/events/drag.md
index d082d4d..94ba613 100644
--- a/docs/events/drag.md
+++ b/docs/events/drag.md
@@ -452,7 +452,7 @@ event.dataTransfer.clearData('text/uri-list');
 
 拖动过程中（`dragstart`事件触发后），浏览器会显示一张图片跟随鼠标一起移动，表示被拖动的节点。这张图片是自动创造的，通常显示为被拖动节点的外观，不需要自己动手设置。
 
-`DataTransfer.setDragImage()`方法可以自定义这张图片。它接受三个参数。第一个是`<img>`节点或者`<canvas>`节点，如果省略或为`null`，则使用被拖动的节点的外观；第二个和第三个参数为鼠标相对于该图片左上角的横坐标和右坐标。
+`DataTransfer.setDragImage()`方法可以自定义这张图片。它接受三个参数。第一个是`<img>`节点或者`<canvas>`节点，如果省略或为`null`，则使用被拖动的节点的外观；第二个和第三个参数为鼠标相对于该图片左上角的横坐标和纵坐标。
 
 下面是一个例子。
 

From 9ab17c05c08b336d92de53f58380c78dacc051c0 Mon Sep 17 00:00:00 2001
From: Lean You <7764115+byog@users.noreply.github.com>
Date: Thu, 27 Aug 2020 23:39:32 +0800
Subject: [PATCH 006/123] Update engine.md
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

参考 MDN 上的介绍和自己的理解
---
 docs/bom/engine.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/bom/engine.md b/docs/bom/engine.md
index b42197c..006a43d 100644
--- a/docs/bom/engine.md
+++ b/docs/bom/engine.md
@@ -372,13 +372,13 @@ foo.style.marginTop = '30px';
 - 使用`documentFragment`操作 DOM
 - 动画使用`absolute`定位或`fixed`定位，这样可以减少对其他元素的影响。
 - 只在必要时才显示隐藏元素。
-- 使用`window.requestAnimationFrame()`，因为它可以把代码推迟到下一次重流时执行，而不是立即要求页面重流。
+- 使用`window.requestAnimationFrame()`，因为它可以把代码推迟到下一次重绘之前执行，而不是立即要求页面重绘。
 - 使用虚拟 DOM（virtual DOM）库。
 
 下面是一个`window.requestAnimationFrame()`对比效果的例子。
 
 ```javascript
-// 重绘代价高
+// 重流代价高
 function doubleHeight(element) {
   var currentHeight = element.clientHeight;
   element.style.height = (currentHeight * 2) + 'px';

From 913da4be3964b0111996d6ef18d401d7783a9835 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 29 Aug 2020 13:08:29 +0800
Subject: [PATCH 007/123] docs: edit bom/engine & event/drag

---
 docs/bom/engine.md  | 4 ++--
 docs/events/drag.md | 4 +++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/docs/bom/engine.md b/docs/bom/engine.md
index 006a43d..86e7f53 100644
--- a/docs/bom/engine.md
+++ b/docs/bom/engine.md
@@ -6,7 +6,7 @@ JavaScript 是浏览器的内置脚本语言。也就是说，浏览器内置了
 
 ## 代码嵌入网页的方法
 
-网页中嵌入 JavaScript 代码，主要有三种方法。
+网页中嵌入 JavaScript 代码，主要有四种方法。
 
 - `<script>`元素直接嵌入代码。
 - `<script>`标签加载外部脚本
@@ -15,7 +15,7 @@ JavaScript 是浏览器的内置脚本语言。也就是说，浏览器内置了
 
 ### script 元素嵌入代码
 
-`<script>`元素内部可以直接写 JavaScript 代码。
+`<script>`元素内部可以直接写入 JavaScript 代码。
 
 ```html
 <script>
diff --git a/docs/events/drag.md b/docs/events/drag.md
index 94ba613..8764a86 100644
--- a/docs/events/drag.md
+++ b/docs/events/drag.md
@@ -4,7 +4,7 @@
 
 拖拉（drag）指的是，用户在某个对象上按下鼠标键不放，拖动它到另一个位置，然后释放鼠标键，将该对象放在那里。
 
-拖拉的对象有好几种，包括元素节点、图片、链接、选中的文字等等。在网页中，除了元素节点默认不可以拖拉，其他（图片、链接、选中的文字）都是可以直接拖拉的。为了让元素节点可拖拉，可以将该节点的`draggable`属性设为`true`。
+拖拉的对象有好几种，包括元素节点、图片、链接、选中的文字等等。在网页中，除了元素节点默认不可以拖拉，其他（图片、链接、选中的文字）都可以直接拖拉。为了让元素节点可拖拉，可以将该节点的`draggable`属性设为`true`。
 
 ```html
 <div draggable="true">
@@ -12,6 +12,8 @@
 </div>
 ```
 
+上面代码的`div`区块，在网页中可以直接用鼠标拖动。松开鼠标键时，拖动效果就会消失，该区块依然在原来的位置。
+
 `draggable`属性可用于任何元素节点，但是图片（`<img>`）和链接（`<a>`）不加这个属性，就可以拖拉。对于它们，用到这个属性的时候，往往是将其设为`false`，防止拖拉这两种元素。
 
 注意，一旦某个元素节点的`draggable`属性设为`true`，就无法再用鼠标选中该节点内部的文字或子节点了。

From be0c31d7872958280477a70ac16bd57bb0591343 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 10 Sep 2020 21:41:36 +0800
Subject: [PATCH 008/123] docs(operators): fix #185

---
 docs/operators/comparison.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/operators/comparison.md b/docs/operators/comparison.md
index c348da5..020bde4 100644
--- a/docs/operators/comparison.md
+++ b/docs/operators/comparison.md
@@ -74,7 +74,7 @@ true > false // true
 
 上面代码中，字符串和布尔值都会先转成数值，再进行比较。
 
-这里需要注意与`NaN`的比较。任何值（包括`NaN`本身）与`NaN`比较，返回的都是`false`。
+这里需要注意与`NaN`的比较。任何值（包括`NaN`本身）与`NaN`使用非相等运算符进行比较，返回的都是`false`。
 
 ```javascript
 1 > NaN // false

From e12104298777ab00beccce782bc3b5122a7cff15 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 15 Sep 2020 16:18:22 +0800
Subject: [PATCH 009/123] docs(operator/comparison): fix #186

---
 docs/operators/comparison.md | 49 +++++++++++++-----
 package-lock.json            | 96 +++++++++++++++---------------------
 package.json                 |  2 +-
 3 files changed, 77 insertions(+), 70 deletions(-)

diff --git a/docs/operators/comparison.md b/docs/operators/comparison.md
index 020bde4..3f34eca 100644
--- a/docs/operators/comparison.md
+++ b/docs/operators/comparison.md
@@ -227,7 +227,7 @@ v1 === v2 // true
 1 === 1.0
 ```
 
-比较不同类型的数据时，相等运算符会先将数据进行类型转换，然后再用严格相等运算符比较。下面分成四种情况，讨论不同类型的值互相比较的规则。
+比较不同类型的数据时，相等运算符会先将数据进行类型转换，然后再用严格相等运算符比较。下面分成几种情况，讨论不同类型的值互相比较的规则。
 
 **（1）原始类型值**
 
@@ -272,38 +272,61 @@ v1 === v2 // true
 
 对象（这里指广义的对象，包括数组和函数）与原始类型的值比较时，对象转换成原始类型的值，再进行比较。
 
+具体来说，先调用对象的`valueOf()`方法，如果得到原始类型的值，就按照上一小节的规则，互相比较；如果得到的还是对象，则再调用`toString()`方法，得到字符串形式，再进行比较。
+
+下面是数组与原始类型值比较的例子。
+
 ```javascript
-// 对象与数值比较时，对象转为数值
+// 数组与数值的比较
 [1] == 1 // true
-// 等同于 Number([1]) == 1
 
-// 对象与字符串比较时，对象转为字符串
+// 数组与字符串的比较
 [1] == '1' // true
-// 等同于 String([1]) == '1'
 [1, 2] == '1,2' // true
-// 等同于 String([1, 2]) == '1,2'
 
-// 对象与布尔值比较时，两边都转为数值
+// 对象与布尔值的比较
 [1] == true // true
-// 等同于 Number([1]) == Number(true)
 [2] == true // false
-// 等同于 Number([2]) == Number(true)
 ```
 
-上面代码中，数组`[1]`与数值进行比较，会先转成数值，再进行比较；与字符串进行比较，会先转成字符串，再进行比较；与布尔值进行比较，对象和布尔值都会先转成数值，再进行比较。
+上面例子中，JavaScript 引擎会先对数组`[1]`调用数组的`valueOf()`方法，由于返回的还是一个数组，所以会接着调用数组的`toString()`方法，得到字符串形式，再按照上一小节的规则进行比较。
+
+下面是一个更直接的例子。
+
+```javascript
+const obj = {
+  valueOf: function () {
+    console.log('执行 valueOf()');
+    return obj;
+  },
+  toString: function () {
+    console.log('执行 toString()');
+    return 'foo';
+  }
+};
+
+obj == 'foo'
+// 执行 valueOf()
+// 执行 toString()
+// true
+```
+
+上面例子中，`obj`是一个自定义了`valueOf()`和`toString()`方法的对象。这个对象与字符串`'foo'`进行比较时，会依次调用`valueOf()`和`toString()`方法，最后返回`'foo'`，所以比较结果是`true`。
 
 **（3）undefined 和 null**
 
-`undefined`和`null`与其他类型的值比较时，结果都为`false`，它们互相比较时结果为`true`。
+`undefined`和`null`只有与自身比较，或者互相比较时，才会返回`true`；与其他类型的值比较时，结果都为`false`。
 
 ```javascript
+undefined == undefined // true
+null == null // true
+undefined == null // true
+
 false == null // false
 false == undefined // false
 
 0 == null // false
 0 == undefined // false
-
-undefined == null // true
 ```
 
 **（4）相等运算符的缺点**
diff --git a/package-lock.json b/package-lock.json
index bc1165e..adeb3be 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,24 +5,24 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
-      "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
       "requires": {
-        "@babel/highlight": "^7.8.3"
+        "@babel/highlight": "^7.10.4"
       }
     },
     "@babel/helper-validator-identifier": {
-      "version": "7.9.5",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.9.5.tgz",
-      "integrity": "sha512-/8arLKUFq882w4tWGj9JYzRpAlZgiWUJ+dtteNTDqrRBz9Iguck9Rn3ykuBDoUwh2TO4tSAJlrxDUOXWklJe4g=="
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw=="
     },
     "@babel/highlight": {
-      "version": "7.9.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
-      "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
       "requires": {
-        "@babel/helper-validator-identifier": "^7.9.0",
+        "@babel/helper-validator-identifier": "^7.10.4",
         "chalk": "^2.0.0",
         "js-tokens": "^4.0.0"
       },
@@ -73,14 +73,6 @@
         }
       }
     },
-    "@babel/runtime": {
-      "version": "7.9.2",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.9.2.tgz",
-      "integrity": "sha512-NE2DtOdufG7R5vnfQUTehdTfNycfUANEtCa9PssN9O/xmTzP4E08UI797ixaei6hBEVL9BI/PsdJS5x7mWoB9Q==",
-      "requires": {
-        "regenerator-runtime": "^0.13.4"
-      }
-    },
     "@types/color-name": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
@@ -178,9 +170,9 @@
       "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo="
     },
     "chalk": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.0.0.tgz",
-      "integrity": "sha512-N9oWFcegS0sFr9oh1oz2d7Npos6vNoWW9HvtCg5N1KRFpUhaAhvTv5Y58g880fZaEYSNm3qDz8SU1UrGvp+n7A==",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
+      "integrity": "sha512-qwx12AxXe2Q5xQ43Ac//I6v5aXTipYrSESdOgzrN+9XjgEpyjpKuvSGaN4qE93f7TQTlerQQ8S+EQ0EyDoVL1A==",
       "requires": {
         "ansi-styles": "^4.1.0",
         "supports-color": "^7.1.0"
@@ -274,15 +266,15 @@
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-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-6.0.0.tgz",
-      "integrity": "sha512-xb3ZL6+L8b9JLLCx3ZdoZy4+2ECphCMo2PwqgP1tlfVq6M6YReyzBJtvWWtbDSpNr9hn96pkCiZqUcFEc+54Qg==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
+      "integrity": "sha512-pondGvTuVYDk++upghXJabWzL6Kxu6f26ljFw64Swq9v6sQPUL3EUlVDV56diOjpCayKihL6hVe8exIACU4XcA==",
       "requires": {
         "@types/parse-json": "^4.0.0",
-        "import-fresh": "^3.1.0",
+        "import-fresh": "^3.2.1",
         "parse-json": "^5.0.0",
         "path-type": "^4.0.0",
-        "yaml": "^1.7.2"
+        "yaml": "^1.10.0"
       }
     },
     "date-format": {
@@ -658,14 +650,14 @@
       }
     },
     "husky": {
-      "version": "4.2.5",
-      "resolved": "https://registry.npmjs.org/husky/-/husky-4.2.5.tgz",
-      "integrity": "sha512-SYZ95AjKcX7goYVZtVZF2i6XiZcHknw50iXvY7b0MiGoj5RwdgRQNEHdb+gPDPCXKlzwrybjFjkL6FOj8uRhZQ==",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.0.tgz",
+      "integrity": "sha512-tTMeLCLqSBqnflBZnlVDhpaIMucSGaYyX6855jM4AguGeWCeSzNdb1mfyWduTZ3pe3SJVvVWGL0jO1iKZVPfTA==",
       "requires": {
         "chalk": "^4.0.0",
         "ci-info": "^2.0.0",
         "compare-versions": "^3.6.0",
-        "cosmiconfig": "^6.0.0",
+        "cosmiconfig": "^7.0.0",
         "find-versions": "^3.2.0",
         "opencollective-postinstall": "^2.0.2",
         "pkg-dir": "^4.2.0",
@@ -739,10 +731,10 @@
         "esprima": "^4.0.0"
       }
     },
-    "json-parse-better-errors": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz",
-      "integrity": "sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw=="
+    "json-parse-even-better-errors": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz",
+      "integrity": "sha512-xyFwyhro/JEof6Ghe2iz2NcXoj2sloNsWr/XsERDK/oiPCfaNhl5ONfp+jQdAZRQQ0IJWNzH9zIZF7li91kh2w=="
     },
     "jsonfile": {
       "version": "4.0.0",
@@ -1155,9 +1147,9 @@
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     },
     "opencollective-postinstall": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/opencollective-postinstall/-/opencollective-postinstall-2.0.2.tgz",
-      "integrity": "sha512-pVOEP16TrAO2/fjej1IdOyupJY8KDUM1CvsaScRbw6oddvpQoOfGk4ywha0HKKVAD6RkW4x6Q+tNBwhf3Bgpuw=="
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/opencollective-postinstall/-/opencollective-postinstall-2.0.3.tgz",
+      "integrity": "sha512-8AV/sCtuzUeTo8gQK5qDZzARrulB3egtLzFgteqB2tcT4Mw7B8Kt7JcDHmltjz6FOAHsvTevk70gZEbhM4ZS9Q=="
     },
     "os-locale": {
       "version": "1.4.0",
@@ -1205,13 +1197,13 @@
       }
     },
     "parse-json": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.0.0.tgz",
-      "integrity": "sha512-OOY5b7PAEFV0E2Fir1KOkxchnZNCdowAJgQ5NuxjpBKTRP3pQhwkrkxqQjeoKJ+fO7bCpmIZaogI4eZGDMEGOw==",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.1.0.tgz",
+      "integrity": "sha512-+mi/lmVVNKFNVyLXV31ERiy2CY5E1/F6QtJFEzoChPRwwngMNXRDQ9GJ5WdE2Z2P4AujsOi0/+2qHID68KwfIQ==",
       "requires": {
         "@babel/code-frame": "^7.0.0",
         "error-ex": "^1.3.1",
-        "json-parse-better-errors": "^1.0.1",
+        "json-parse-even-better-errors": "^2.3.0",
         "lines-and-columns": "^1.1.6"
       }
     },
@@ -1377,11 +1369,6 @@
         "util-deprecate": "^1.0.1"
       }
     },
-    "regenerator-runtime": {
-      "version": "0.13.5",
-      "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.5.tgz",
-      "integrity": "sha512-ZS5w8CpKFinUzOwW3c83oPeVXoNsrLsaCoLtJvAClH135j/R77RuymhiSErhm2lKcwSCIpmvIWSbDkIfAqKQlA=="
-    },
     "relateurl": {
       "version": "0.2.7",
       "resolved": "https://registry.npmjs.org/relateurl/-/relateurl-0.2.7.tgz",
@@ -1624,9 +1611,9 @@
       "integrity": "sha1-IrD6OkE4WzO+PzMVUbu4N/oM164="
     },
     "supports-color": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.1.0.tgz",
-      "integrity": "sha512-oRSIpR8pxT1Wr2FquTNnGet79b3BWljqOuoW/h4oBhxJ/HUbX5nX6JSruTkvXDCFMwDPvsaTTbvMLKZWSy0R5g==",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
       "requires": {
         "has-flag": "^4.0.0"
       }
@@ -1800,12 +1787,9 @@
       "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
     },
     "yaml": {
-      "version": "1.8.3",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.8.3.tgz",
-      "integrity": "sha512-X/v7VDnK+sxbQ2Imq4Jt2PRUsRsP7UcpSl3Llg6+NRRqWLIvxkMFYtH1FmvwNGYRKKPa+EPA4qDBlI9WVG1UKw==",
-      "requires": {
-        "@babel/runtime": "^7.8.7"
-      }
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
+      "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg=="
     },
     "yargs": {
       "version": "15.3.1",
diff --git a/package.json b/package.json
index ecfb296..a13bac1 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
     "gh-pages": "^3.1.0",
-    "husky": "latest",
+    "husky": "^4.3.0",
     "loppo": "latest",
     "loppo-theme-wangdoc": "^0.4.6"
   }

From 1fb851ba54f080f019b6282eba6fe3156881407e Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 15 Sep 2020 21:37:43 +0800
Subject: [PATCH 010/123] refactor: update dependencies

---
 package-lock.json | 666 +++++++++++-----------------------------------
 package.json      |   2 +-
 2 files changed, 156 insertions(+), 512 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index adeb3be..be3471c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -89,9 +89,9 @@
       "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA=="
     },
     "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+      "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg=="
     },
     "ansi-styles": {
       "version": "4.2.1",
@@ -164,11 +164,6 @@
         "upper-case": "^1.1.1"
       }
     },
-    "camelcase": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
-      "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo="
-    },
     "chalk": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
@@ -192,13 +187,13 @@
       }
     },
     "cliui": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
-      "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.1.tgz",
+      "integrity": "sha512-rcvHOWyGyid6I1WjT/3NatKj2kDt9OdSHSXpyLXaMWFbKpGACNW8pRhhdPUq9MWUOdwn8Rz9AVETjF4105rZZQ==",
       "requires": {
-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1",
-        "wrap-ansi": "^2.0.0"
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^7.0.0"
       }
     },
     "clone": {
@@ -206,11 +201,6 @@
       "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
       "integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18="
     },
-    "code-point-at": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
-    },
     "color-convert": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
@@ -297,11 +287,6 @@
         }
       }
     },
-    "decamelize": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
-      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA="
-    },
     "depd": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
@@ -322,14 +307,14 @@
       },
       "dependencies": {
         "domelementtype": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.0.1.tgz",
-          "integrity": "sha512-5HOHUDsYZWV8FGWN0Njbr/Rn7f/eWSQi1v7+HsUVwXgn8nWWlL64zKDkS0n8ZmQ3mlWOMuXOnR+7Nx/5tMO5AQ=="
+          "version": "2.0.2",
+          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.0.2.tgz",
+          "integrity": "sha512-wFwTwCVebUrMgGeAwRL/NhZtHAUyT9n9yg4IMDwf10+6iCMxSkVq9MGCVEH+QZWo1nNidy8kNvwmv4zWHDTqvA=="
         },
         "entities": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/entities/-/entities-2.0.0.tgz",
-          "integrity": "sha512-D9f7V0JSRwIxlRI2mjMqufDrRDnx8p+eEOz7aUM9SuvF8gsBzra0/6tbjl1m8eQHrZlYj6PxqE00hZ1SAIKPLw=="
+          "version": "2.0.3",
+          "resolved": "https://registry.npmjs.org/entities/-/entities-2.0.3.tgz",
+          "integrity": "sha512-MyoZ0jgnLvB2X3Lg5HqpFmn1kybDiIfEQmKzTb5apr51Rb+T3KdmMiqa70T+bhGnyv7bQ6WMj2QMHpGMmlrUYQ=="
         }
       }
     },
@@ -393,6 +378,11 @@
         "is-arrayish": "^0.2.1"
       }
     },
+    "escalade": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.0.tgz",
+      "integrity": "sha512-mAk+hPSO8fLDkhV7V0dXazH5pDc6MrjBTPyD3VeKzxnVFjH1MIxbCdqGZB9O8+EwWakZs3ZCbDS4IpRt79V1ig=="
+    },
     "escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -514,9 +504,9 @@
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
     "get-caller-file": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
-      "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w=="
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg=="
     },
     "gh-pages": {
       "version": "3.1.0",
@@ -581,14 +571,9 @@
       "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw=="
     },
     "highlight.js": {
-      "version": "9.18.1",
-      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-9.18.1.tgz",
-      "integrity": "sha512-OrVKYz70LHsnCgmbXctv/bfuvntIKDz177h0Co37DQ5jamGZLVmoCVMtjMtNZY3X9DrCcKfklHPNeA0uPZhSJg=="
-    },
-    "hosted-git-info": {
-      "version": "2.8.8",
-      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.8.tgz",
-      "integrity": "sha512-f/wzC2QaWBs7t9IYqB4T3sR1xviIViXJRJTWBlx2Gf3g0Xi5vI7Yy4koXQ1c9OYDGHN9sBy1DQ2AB8fqZBWhUg=="
+      "version": "10.2.0",
+      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-10.2.0.tgz",
+      "integrity": "sha512-OryzPiqqNCfO/wtFo619W+nPYALM6u7iCQkum4bqRmmlcTikOkmlL06i009QelynBPAlNByTQU6cBB2cOBQtCw=="
     },
     "html-minifier": {
       "version": "4.0.0",
@@ -689,43 +674,30 @@
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
       "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
     },
-    "invert-kv": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-1.0.0.tgz",
-      "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY="
-    },
     "is-arrayish": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.2.1.tgz",
       "integrity": "sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0="
     },
     "is-fullwidth-code-point": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
-      "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
-      "requires": {
-        "number-is-nan": "^1.0.0"
-      }
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+      "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
     },
     "is-plain-obj": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-1.1.0.tgz",
       "integrity": "sha1-caUMhCnfync8kqOQpKA7OfzVHT4="
     },
-    "is-utf8": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/is-utf8/-/is-utf8-0.2.1.tgz",
-      "integrity": "sha1-Sw2hRCEE0bM2NA6AeX6GXPOffXI="
-    },
     "js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
       "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ=="
     },
     "js-yaml": {
-      "version": "3.13.1",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.13.1.tgz",
-      "integrity": "sha512-YfbcO7jXDdyj0DGxYVSlSeQNHbD7XPWvrVWeVUujrQEoZzWJIRrCPoyk6kL6IAjAG2IolMK4T0hNUe0HOUs5Jw==",
+      "version": "3.14.0",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.0.tgz",
+      "integrity": "sha512-/4IbIeHcD9VMHFqDR/gQ7EdZdLimOvW2DdcxFjdyyZ9NsbS+ccrXqVWDtab/lRl5AlUqmpBx8EhPaWR+OtY17A==",
       "requires": {
         "argparse": "^1.0.7",
         "esprima": "^4.0.0"
@@ -752,49 +724,19 @@
         "match-at": "^0.1.0"
       }
     },
-    "lcid": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
-      "integrity": "sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=",
-      "requires": {
-        "invert-kv": "^1.0.0"
-      }
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     "lines-and-columns": {
       "version": "1.1.6",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.1.6.tgz",
       "integrity": "sha1-HADHQ7QzzQpOgHWPe2SldEDZ/wA="
     },
     "linkify-it": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/linkify-it/-/linkify-it-2.2.0.tgz",
-      "integrity": "sha512-GnAl/knGn+i1U/wjBz3akz2stz+HrHLsxMwHQGofCDfPvlf+gDKN58UtfmUquTY4/MXeE2x7k19KQmeoZi94Iw==",
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/linkify-it/-/linkify-it-3.0.2.tgz",
+      "integrity": "sha512-gDBO4aHNZS6coiZCKVhSNh43F9ioIL4JwRjLZPkoLIY4yZFwg264Y5lu2x6rb1Js42Gh6Yqm2f6L2AJcnkzinQ==",
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-        }
+        "y18n": "^5.0.1",
+        "yargs-parser": "^20.0.0"
       }
     },
     "yargs-parser": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0.tgz",
-      "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
-      "requires": {
-        "camelcase": "^3.0.0"
-      }
+      "version": "20.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.0.0.tgz",
+      "integrity": "sha512-8eblPHTL7ZWRkyjIZJjnGf+TijiKJSwA24svzLRVvtgoi/RZiKa9fFQTrlx0OKLnyHSdt/enrdadji6WFfESVA=="
     }
   }
 }
diff --git a/package.json b/package.json
index a13bac1..e2fb260 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
   "dependencies": {
     "gh-pages": "^3.1.0",
     "husky": "^4.3.0",
-    "loppo": "latest",
+    "loppo": "^0.6.20",
     "loppo-theme-wangdoc": "^0.4.6"
   }
 }

From 3336dabf0d46544a17651deee62e74a257ac2ed9 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 23 Sep 2020 19:13:09 +0800
Subject: [PATCH 011/123] docs(events): fix typo

---
 docs/events/keyboard.md | 4 ++--
 docs/events/mouse.md    | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/events/keyboard.md b/docs/events/keyboard.md
index 4d689d0..4e33320 100644
--- a/docs/events/keyboard.md
+++ b/docs/events/keyboard.md
@@ -66,9 +66,9 @@ document.body.addEventListener('keydown', showChar, false);
 
 `KeyboardEvent.code`属性返回一个字符串，表示当前按下的键的字符串形式。该属性只读。
 
-下面是一些常用键的字符串形式，其他键请查[文档](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code#Code_values)。
+下面是一些常用键的字符串形式，其他键请查[文档](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code/code_values)。
 
-- 数字键0 - 9：返回`digital0` - `digital9`
+- 数字键0 - 9：返回`digit0` - `digit9`
 - 字母键A - z：返回`KeyA` - `KeyZ`
 - 功能键F1 - F12：返回 `F1` - `F12`
 - 方向键：返回`ArrowDown`、`ArrowUp`、`ArrowLeft`、`ArrowRight`
diff --git a/docs/events/mouse.md b/docs/events/mouse.md
index eb1a919..177217d 100644
--- a/docs/events/mouse.md
+++ b/docs/events/mouse.md
@@ -313,7 +313,7 @@ document.body.addEventListener(
 ```javascript
 /*
   HTML 代码如下
-  <div id="outer" style="height:50px;width:50px;border-width:1px solid black;">
+  <div id="outer" style="height:50px;width:50px;border:1px solid black;">
     <div id="inner" style="height:25px;width:25px;border:1px solid black;"></div>
   </div>
 */

From 26a4628dbb7e4d366e2cdfbdf881449a5204edbf Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 26 Sep 2020 10:23:55 +0800
Subject: [PATCH 012/123] docs(stdlib): edit JSON

---
 docs/stdlib/json.md | 77 ++++++++++++++++++++++++++-------------------
 1 file changed, 44 insertions(+), 33 deletions(-)

diff --git a/docs/stdlib/json.md b/docs/stdlib/json.md
index b4250aa..dfe1b76 100644
--- a/docs/stdlib/json.md
+++ b/docs/stdlib/json.md
@@ -59,7 +59,7 @@ JSON 对值的类型和格式有严格的规定。
 
 ### 基本用法
 
-`JSON.stringify`方法用于将一个值转为 JSON 字符串。该字符串符合 JSON 格式，并且可以被`JSON.parse`方法还原。
+`JSON.stringify()`方法用于将一个值转为 JSON 字符串。该字符串符合 JSON 格式，并且可以被`JSON.parse()`方法还原。
 
 ```javascript
 JSON.stringify('abc') // ""abc""
@@ -93,7 +93,7 @@ JSON.stringify('false') // "\"false\""
 
 上面代码中，如果不是内层的双引号，将来还原的时候，引擎就无法知道原始值是布尔值还是字符串。
 
-如果对象的属性是`undefined`、函数或 XML 对象，该属性会被`JSON.stringify`过滤。
+如果对象的属性是`undefined`、函数或 XML 对象，该属性会被`JSON.stringify()`过滤。
 
 ```javascript
 var obj = {
@@ -121,7 +121,7 @@ JSON.stringify(arr) // "[null,null]"
 JSON.stringify(/foo/) // "{}"
 ```
 
-`JSON.stringify`方法会忽略对象的不可遍历的属性。
+`JSON.stringify()`方法会忽略对象的不可遍历的属性。
 
 ```javascript
 var obj = {};
@@ -143,7 +143,7 @@ JSON.stringify(obj); // "{"foo":1}"
 
 ### 第二个参数
 
-`JSON.stringify`方法还可以接受一个数组，作为第二个参数，指定需要转成字符串的属性。
+`JSON.stringify()`方法还可以接受一个数组，作为第二个参数，指定参数对象的哪些属性需要转成字符串。
 
 ```javascript
 var obj = {
@@ -158,7 +158,7 @@ JSON.stringify(obj, selectedProperties)
 // "{"prop1":"value1","prop2":"value2"}"
 ```
 
-上面代码中，`JSON.stringify`方法的第二个参数指定，只转`prop1`和`prop2`两个属性。
+上面代码中，`JSON.stringify()`方法的第二个参数指定，只转`prop1`和`prop2`两个属性。
 
 这个类似白名单的数组，只对对象的属性有效，对数组无效。
 
@@ -172,7 +172,7 @@ JSON.stringify({0: 'a', 1: 'b'}, ['0'])
 
 上面代码中，第二个参数指定 JSON 格式只转`0`号属性，实际上对数组是无效的，只对对象有效。
 
-第二个参数还可以是一个函数，用来更改`JSON.stringify`的返回值。
+第二个参数还可以是一个函数，用来更改`JSON.stringify()`的返回值。
 
 ```javascript
 function f(key, value) {
@@ -191,26 +191,26 @@ JSON.stringify({ a: 1, b: 2 }, f)
 注意，这个处理函数是递归处理所有的键。
 
 ```javascript
-var o = {a: {b: 1}};
+var obj = {a: {b: 1}};
 
 function f(key, value) {
   console.log("["+ key +"]:" + value);
   return value;
 }
 
-JSON.stringify(o, f)
+JSON.stringify(obj, f)
 // []:[object Object]
 // [a]:[object Object]
 // [b]:1
 // '{"a":{"b":1}}'
 ```
 
-上面代码中，对象`o`一共会被`f`函数处理三次，最后那行是`JSON.stringify`的输出。第一次键名为空，键值是整个对象`o`；第二次键名为`a`，键值是`{b: 1}`；第三次键名为`b`，键值为1。
+上面代码中，对象`obj`一共会被`f`函数处理三次，输出的最后那行是`JSON.stringify()`的默认输出。第一次键名为空，键值是整个对象`obj`；第二次键名为`a`，键值是`{b: 1}`；第三次键名为`b`，键值为1。
 
 递归处理中，每一次处理的对象，都是前一次返回的值。
 
 ```javascript
-var o = {a: 1};
+var obj = {a: 1};
 
 function f(key, value) {
   if (typeof value === 'object') {
@@ -219,11 +219,11 @@ function f(key, value) {
   return value * 2;
 }
 
-JSON.stringify(o, f)
+JSON.stringify(obj, f)
 // "{"b": 4}"
 ```
 
-上面代码中，`f`函数修改了对象`o`，接着`JSON.stringify`方法就递归处理修改后的对象`o`。
+上面代码中，`f`函数修改了对象`obj`，接着`JSON.stringify()`方法就递归处理修改后的对象`obj`。
 
 如果处理函数返回`undefined`或没有返回值，则该属性会被忽略。
 
@@ -243,7 +243,26 @@ JSON.stringify({ a: "abc", b: 123 }, f)
 
 ### 第三个参数
 
-`JSON.stringify`还可以接受第三个参数，用于增加返回的 JSON 字符串的可读性。如果是数字，表示每个属性前面添加的空格（最多不超过10个）；如果是字符串（不超过10个字符），则该字符串会添加在每行前面。
+`JSON.stringify()`还可以接受第三个参数，用于增加返回的 JSON 字符串的可读性。
+
+默认返回的是单行字符串，对于大型的 JSON 对象，可读性非常差。第三个参数使得每个属性单独占据一行，并且将每个属性前面添加指定的前缀（不超过10个字符）。
+
+```javascript
+// 默认输出
+JSON.stringify({ p1: 1, p2: 2 })
+// JSON.stringify({ p1: 1, p2: 2 })
+
+// 分行输出
+JSON.stringify({ p1: 1, p2: 2 }, null, '\t')
+// {
+// 	"p1": 1,
+// 	"p2": 2
+// }
+```
+
+上面例子中，第三个属性`\t`在每个属性前面添加一个制表符，然后分行显示。
+
+第三个属性如果是一个数字，则表示每个属性前面添加的空格（最多不超过10个）。
 
 ```javascript
 JSON.stringify({ p1: 1, p2: 2 }, null, 2);
@@ -253,19 +272,11 @@ JSON.stringify({ p1: 1, p2: 2 }, null, 2);
   "p2": 2
 }"
 */
-
-JSON.stringify({ p1:1, p2:2 }, null, '|-');
-/*
-"{
-|-"p1": 1,
-|-"p2": 2
-}"
-*/
 ```
 
-### 参数对象的 toJSON 方法
+### 参数对象的 toJSON() 方法
 
-如果参数对象有自定义的`toJSON`方法，那么`JSON.stringify`会使用这个方法的返回值作为参数，而忽略原对象的其他属性。
+如果参数对象有自定义的`toJSON()`方法，那么`JSON.stringify()`会使用这个方法的返回值作为参数，而忽略原对象的其他属性。
 
 下面是一个普通的对象。
 
@@ -283,7 +294,7 @@ JSON.stringify(user)
 // "{"firstName":"三","lastName":"张","fullName":"张三"}"
 ```
 
-现在，为这个对象加上`toJSON`方法。
+现在，为这个对象加上`toJSON()`方法。
 
 ```javascript
 var user = {
@@ -305,9 +316,9 @@ JSON.stringify(user)
 // "{"name":"张三"}"
 ```
 
-上面代码中，`JSON.stringify`发现参数对象有`toJSON`方法，就直接使用这个方法的返回值作为参数，而忽略原对象的其他参数。
+上面代码中，`JSON.stringify()`发现参数对象有`toJSON()`方法，就直接使用这个方法的返回值作为参数，而忽略原对象的其他参数。
 
-`Date`对象就有一个自己的`toJSON`方法。
+`Date`对象就有一个自己的`toJSON()`方法。
 
 ```javascript
 var date = new Date('2015-01-01');
@@ -315,9 +326,9 @@ date.toJSON() // "2015-01-01T00:00:00.000Z"
 JSON.stringify(date) // ""2015-01-01T00:00:00.000Z""
 ```
 
-上面代码中，`JSON.stringify`发现处理的是`Date`对象实例，就会调用这个实例对象的`toJSON`方法，将该方法的返回值作为参数。
+上面代码中，`JSON.stringify()`发现处理的是`Date`对象实例，就会调用这个实例对象的`toJSON()`方法，将该方法的返回值作为参数。
 
-`toJSON`方法的一个应用是，将正则对象自动转为字符串。因为`JSON.stringify`默认不能转换正则对象，但是设置了`toJSON`方法以后，就可以转换正则对象了。
+`toJSON()`方法的一个应用是，将正则对象自动转为字符串。因为`JSON.stringify()`默认不能转换正则对象，但是设置了`toJSON()`方法以后，就可以转换正则对象了。
 
 ```javascript
 var obj = {
@@ -336,7 +347,7 @@ JSON.stringify(/foo/) // ""/foo/""
 
 ## JSON.parse()
 
-`JSON.parse`方法用于将 JSON 字符串转换成对应的值。
+`JSON.parse()`方法用于将 JSON 字符串转换成对应的值。
 
 ```javascript
 JSON.parse('{}') // {}
@@ -349,7 +360,7 @@ var o = JSON.parse('{"name": "张三"}');
 o.name // 张三
 ```
 
-如果传入的字符串不是有效的 JSON 格式，`JSON.parse`方法将报错。
+如果传入的字符串不是有效的 JSON 格式，`JSON.parse()`方法将报错。
 
 ```javascript
 JSON.parse("'String'") // illegal single quotes
@@ -358,7 +369,7 @@ JSON.parse("'String'") // illegal single quotes
 
 上面代码中，双引号字符串中是一个单引号字符串，因为单引号字符串不符合 JSON 格式，所以报错。
 
-为了处理解析错误，可以将`JSON.parse`方法放在`try...catch`代码块中。
+为了处理解析错误，可以将`JSON.parse()`方法放在`try...catch`代码块中。
 
 ```javascript
 try {
@@ -368,7 +379,7 @@ try {
 }
 ```
 
-`JSON.parse`方法可以接受一个处理函数，作为第二个参数，用法与`JSON.stringify`方法类似。
+`JSON.parse()`方法可以接受一个处理函数，作为第二个参数，用法与`JSON.stringify()`方法类似。
 
 ```javascript
 function f(key, value) {
@@ -382,7 +393,7 @@ JSON.parse('{"a": 1, "b": 2}', f)
 // {a: 11, b: 2}
 ```
 
-上面代码中，`JSON.parse`的第二个参数是一个函数，如果键名是`a`，该函数会将键值加上10。
+上面代码中，`JSON.parse()`的第二个参数是一个函数，如果键名是`a`，该函数会将键值加上10。
 
 ## 参考链接
 

From f86175c4daedbc6806c261baa44ac61a3f51a37d Mon Sep 17 00:00:00 2001
From: Jacty <jacty@users.noreply.github.com>
Date: Sun, 27 Sep 2020 16:08:10 +0800
Subject: [PATCH 013/123] Typo

typo
---
 docs/types/function.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index 70c41ee..6144979 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -828,7 +828,7 @@ f // 1
 (function(){ /* code */ })();
 ```
 
-上面两种写法都是以圆括号开头，引擎就会认为后面跟的是一个表示式，而不是函数定义语句，所以就避免了错误。这就叫做“立即调用的函数表达式”（Immediately-Invoked Function Expression），简称 IIFE。
+上面两种写法都是以圆括号开头，引擎就会认为后面跟的是一个表达式，而不是函数定义语句，所以就避免了错误。这就叫做“立即调用的函数表达式”（Immediately-Invoked Function Expression），简称 IIFE。
 
 注意，上面两种写法最后的分号都是必须的。如果省略分号，遇到连着两个 IIFE，可能就会报错。
 

From 8259709a2668dd59ba01391967ecbeb5f242b9f6 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 27 Sep 2020 18:55:32 +0800
Subject: [PATCH 014/123] docs(types/function): fix typo

---
 docs/types/function.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index 6144979..6792f03 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -816,11 +816,11 @@ var f = function f(){ return 1}();
 f // 1
 ```
 
-上面的代码中，函数定义后直接加圆括号调用，没有报错。原因就是`function`作为表达式，引擎就把函数定义当作一个值。这种情况下，就不会报错
+上面的代码中，函数定义后直接加圆括号调用，没有报错。原因就是`function`作为表达式，引擎就把函数定义当作一个值。这种情况下，就不会报错。
 
 为了避免解析的歧义，JavaScript 规定，如果`function`关键字出现在行首，一律解释成语句。因此，引擎看到行首是`function`关键字之后，认为这一段都是函数的定义，不应该以圆括号结尾，所以就报错了。
 
-解决方法就是不要让`function`出现在行首，让引擎将其理解成一个表达式。最简单的处理，就是将其放在一个圆括号里面。
+函数定义后立即调用的解决方法，就是不要让`function`出现在行首，让引擎将其理解成一个表达式。最简单的处理，就是将其放在一个圆括号里面。
 
 ```javascript
 (function(){ /* code */ }());

From aa04c24e40cd52184220467115dd674aaed2e636 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 27 Sep 2020 19:09:14 +0800
Subject: [PATCH 015/123] docs(types/function): fix #188

---
 docs/types/function.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index 6792f03..82c3e0c 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -695,7 +695,7 @@ f1() // 999
 
 上面代码中，函数`f1`可以读取全局变量`n`。
 
-但是，函数外部无法读取函数内部声明的变量。
+但是，正常情况下，函数外部无法读取函数内部声明的变量。
 
 ```javascript
 function f1() {

From f53a87adc2064aa43300c44a7b182991b305c819 Mon Sep 17 00:00:00 2001
From: None <lutherlau@foxmail.com>
Date: Thu, 1 Oct 2020 20:06:24 +0800
Subject: [PATCH 016/123] Update event.md

docs(events): fix typo
---
 docs/events/event.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/events/event.md b/docs/events/event.md
index e7576c5..57c33c7 100644
--- a/docs/events/event.md
+++ b/docs/events/event.md
@@ -114,7 +114,7 @@ if (event.defaultPrevented) {
 
 ### Event.currentTarget，Event.target
 
-事件发生以后，会经过捕获和冒泡两个阶段，依次通过多个 DOM 节点。因此，任意时点都有两个与事件相关的节点，一个是事件的原始触发节点（`Event.target`），另一个是事件当前正在通过的节点（`Event.currentTarget`）。前者通常是后者的后代节点。
+事件发生以后，会经过捕获和冒泡两个阶段，依次通过多个 DOM 节点。因此，任意事件都有两个与事件相关的节点，一个是事件的原始触发节点（`Event.target`），另一个是事件当前正在通过的节点（`Event.currentTarget`）。前者通常是后者的后代节点。
 
 `Event.currentTarget`属性返回事件当前所在的节点，即事件当前正在通过的节点，也就是当前正在执行的监听函数所在的那个节点。随着事件的传播，这个属性的值会变。
 

From f0cdffa3c131c617b8d794d2b4ea7b560ce9e546 Mon Sep 17 00:00:00 2001
From: None <lutherlau@foxmail.com>
Date: Fri, 2 Oct 2020 18:21:47 +0800
Subject: [PATCH 017/123] Update drag.md

docs(events): fix typo
---
 docs/events/drag.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/events/drag.md b/docs/events/drag.md
index 8764a86..4310edb 100644
--- a/docs/events/drag.md
+++ b/docs/events/drag.md
@@ -283,7 +283,7 @@ function doDragOver(event) {
 }
 ```
 
-上面代码中，只有当被拖拉的节点是一个链接时，才允许在当前节点放下。
+上面代码中，只有当被拖拉的节点有一个是链接时，才允许在当前节点放下。
 
 ### DataTransfer.items
 

From df48e91614df0d52125284be7f371e4d6df0d4ed Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 3 Oct 2020 19:53:16 +0800
Subject: [PATCH 018/123] docs(event/common): edit throttle() #193

---
 docs/events/common.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/events/common.md b/docs/events/common.md
index 13bab7f..5ff2d22 100644
--- a/docs/events/common.md
+++ b/docs/events/common.md
@@ -215,7 +215,7 @@ window.addEventListener('optimizedScroll', function() {
 });
 ```
 
-上面代码中，`throttle`函数用于控制事件触发频率，`requestAnimationFrame`方法保证每次页面重绘（每秒60次），只会触发一次`scroll`事件的监听函数。也就是说，上面方法将`scroll`事件的触发频率，限制在每秒60次。具体来说，就是`scroll`事件只要频率低于每秒60次，就会触发`optimizedScroll`事件，从而执行`optimizedScroll`事件的监听函数。
+上面代码中，`throttle`函数用于控制事件触发频率，它有一个内部函数`func`，每次`scroll`事件实际上触发的是这个函数。`func`函数内部使用`requestAnimationFrame()`方法，保证只有每次页面重绘时（每秒60次），才可能会触发`optimizedScroll`事件，从而实际上将`scroll`事件转换为`optimizedScroll`事件，触发频率被控制在每秒最多60次。
 
 改用`setTimeout`方法，可以放置更大的时间间隔。
 

From 2e50838c60be2f731dd873c4da4aa21580d69549 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 3 Oct 2020 20:00:21 +0800
Subject: [PATCH 019/123] docs(events/common): edit throttle()

---
 docs/events/common.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/events/common.md b/docs/events/common.md
index 5ff2d22..7acb5bc 100644
--- a/docs/events/common.md
+++ b/docs/events/common.md
@@ -206,7 +206,7 @@ window.addEventListener('scroll', callback);
     obj.addEventListener(type, func);
   };
 
-  // 将 scroll 事件重定义为 optimizedScroll 事件
+  // 将 scroll 事件转为 optimizedScroll 事件
   throttle('scroll', 'optimizedScroll');
 })();
 
@@ -215,9 +215,9 @@ window.addEventListener('optimizedScroll', function() {
 });
 ```
 
-上面代码中，`throttle`函数用于控制事件触发频率，它有一个内部函数`func`，每次`scroll`事件实际上触发的是这个函数。`func`函数内部使用`requestAnimationFrame()`方法，保证只有每次页面重绘时（每秒60次），才可能会触发`optimizedScroll`事件，从而实际上将`scroll`事件转换为`optimizedScroll`事件，触发频率被控制在每秒最多60次。
+上面代码中，`throttle()`函数用于控制事件触发频率，它有一个内部函数`func()`，每次`scroll`事件实际上触发的是这个函数。`func()`函数内部使用`requestAnimationFrame()`方法，保证只有每次页面重绘时（每秒60次），才可能会触发`optimizedScroll`事件，从而实际上将`scroll`事件转换为`optimizedScroll`事件，触发频率被控制在每秒最多60次。
 
-改用`setTimeout`方法，可以放置更大的时间间隔。
+改用`setTimeout()`方法，可以放置更大的时间间隔。
 
 ```javascript
 (function() {

From 74a452b0929e5a65a8e9203db015451050e5f9bd Mon Sep 17 00:00:00 2001
From: None <lutherlau@foxmail.com>
Date: Thu, 8 Oct 2020 17:16:01 +0800
Subject: [PATCH 020/123] Update window.md

docs(bom): fix typo
---
 docs/bom/window.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/window.md b/docs/bom/window.md
index f5eea3b..72df85d 100644
--- a/docs/bom/window.md
+++ b/docs/bom/window.md
@@ -154,7 +154,7 @@ if (window.parent !== window.top) {
 
 `window.innerHeight`和`window.innerWidth`属性，返回网页在当前窗口中可见部分的高度和宽度，即“视口”（viewport）的大小（单位像素）。这两个属性只读。
 
-用户放大网页的时候（比如将网页从100%的大小放大为200%），这两个属性会变小。因为这时网页的像素大小不变（比如宽度还是960像素），只是每个像素占据的屏幕空间变大了，因为可见部分（视口）就变小了。
+用户放大网页的时候（比如将网页从100%的大小放大为200%），这两个属性会变小。因为这时网页的像素大小不变（比如宽度还是960像素），只是每个像素占据的屏幕空间变大了，因此可见部分（视口）就变小了。
 
 注意，这两个属性值包括滚动条的高度和宽度。
 

From a4c7ad9f242ac95e5d63fbba9fe23695b3fe2787 Mon Sep 17 00:00:00 2001
From: None <lutherlau@foxmail.com>
Date: Thu, 8 Oct 2020 18:26:57 +0800
Subject: [PATCH 021/123] Update window.md

docs(bom): fix typo
---
 docs/bom/window.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/window.md b/docs/bom/window.md
index 72df85d..a012d61 100644
--- a/docs/bom/window.md
+++ b/docs/bom/window.md
@@ -599,7 +599,7 @@ window.requestAnimationFrame(step);
 
 它跟`window.requestAnimationFrame()`的区别在于，后者指定回调函数在下一次浏览器重排时执行，问题在于下一次重排时，系统资源未必空闲，不一定能保证在16毫秒之内完成；`window.requestIdleCallback()`可以保证回调函数在系统资源空闲时执行。
 
-该方法接受一个回调函数和一个配置对象作为参数。配置对象可以指定一个推迟执行的最长时间，如果过了这个时间，回调函数不管系统资源有无空虚，都会执行。
+该方法接受一个回调函数和一个配置对象作为参数。配置对象可以指定一个推迟执行的最长时间，如果过了这个时间，回调函数不管系统资源有无空闲，都会执行。
 
 ```javascript
 window.requestIdleCallback(callback[, options])

From c6b4ccc55d74127b6abfb9794d9dab83cb8719f6 Mon Sep 17 00:00:00 2001
From: None <lutherlau@foxmail.com>
Date: Fri, 9 Oct 2020 09:29:39 +0800
Subject: [PATCH 022/123] Update navigator.md

docs(bom): fix typo
---
 docs/bom/navigator.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/navigator.md b/docs/bom/navigator.md
index f703551..f0644e4 100644
--- a/docs/bom/navigator.md
+++ b/docs/bom/navigator.md
@@ -140,7 +140,7 @@ Screen 对象表示当前窗口所在的屏幕，提供显示设备的信息。`
 - `Screen.availWidth`：浏览器窗口可用的屏幕宽度（单位像素）。
 - `Screen.pixelDepth`：整数，表示屏幕的色彩位数，比如`24`表示屏幕提供24位色彩。
 - `Screen.colorDepth`：`Screen.pixelDepth`的别名。严格地说，colorDepth 表示应用程序的颜色深度，pixelDepth 表示屏幕的颜色深度，绝大多数情况下，它们都是同一件事。
-- `Screen.orientation`：返回一个对象，表示屏幕的方向。该对象的`type`属性是一个字符串，表示屏幕的具体方向，`landscape-primary`表示横放，`landscape-secondary`表示颠倒的横放，`portrait-primary`表示竖放，`portrait-secondary`。
+- `Screen.orientation`：返回一个对象，表示屏幕的方向。该对象的`type`属性是一个字符串，表示屏幕的具体方向，`landscape-primary`表示横放，`landscape-secondary`表示颠倒的横放，`portrait-primary`表示竖放，`portrait-secondary`表示颠倒的竖放。
 
 下面是`Screen.orientation`的例子。
 

From 4e4a5a6c8cf3937caff003ccfc81246efe6219be Mon Sep 17 00:00:00 2001
From: None <lutherlau@foxmail.com>
Date: Sun, 11 Oct 2020 18:53:57 +0800
Subject: [PATCH 023/123] Update webworker.md

docs(bom): fix typo
---
 docs/bom/webworker.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/webworker.md b/docs/bom/webworker.md
index 7a7f38a..618f197 100644
--- a/docs/bom/webworker.md
+++ b/docs/bom/webworker.md
@@ -381,7 +381,7 @@ Worker 线程有一些自己的全局属性和方法。
 - self.onmessage：指定`message`事件的监听函数。
 - self.onmessageerror：指定 messageerror 事件的监听函数。发送的数据无法序列化成字符串时，会触发这个事件。
 - self.close()：关闭 Worker 线程。
-- self.postMessage()：向产生这个 Worker 线程发送消息。
+- self.postMessage()：向产生这个 Worker 的线程发送消息。
 - self.importScripts()：加载 JS 脚本。
 
 （完）

From 09f075801a7c994dd3aa6f3729465213028ee838 Mon Sep 17 00:00:00 2001
From: None <lutherlau@foxmail.com>
Date: Sun, 11 Oct 2020 21:43:33 +0800
Subject: [PATCH 024/123] Update input.md

docs(elements): fix
---
 docs/elements/input.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/elements/input.md b/docs/elements/input.md
index d64c55a..5d76291 100644
--- a/docs/elements/input.md
+++ b/docs/elements/input.md
@@ -84,7 +84,7 @@
 - `select()`：选中`<input>`元素内部的所有文本。该方法不能保证`<input>`获得焦点，最好先用`focus()`方法，再用这个方法。
 - `click()`：模拟鼠标点击当前的`<input>`元素。
 - `setSelectionRange()`：选中`<input>`元素内部的一段文本，但不会将焦点转移到选中的文本。该方法接受三个参数，第一个参数是开始的位置（从0开始），第二个参数是结束的位置（不包括该位置），第三个参数是可选的，表示选择的方向，有三个可能的值（`forward`、`backward`和默认值`none`）。
-- `setRangeText()`：新文本替换选中的文本。该方法接受四个参数，第一个参数是新文本，第二个参数是替换的开始位置，第三个参数是结束位置，第四个参数表示替换后的行为（可选），有四个可能的值：`select`（选中新插入的文本）、`start`（选中的开始位置移到插入的文本之前）、`end`（选中的文本移到插入的文本之后）、`preserve`（保留原先选中的位置，默认值）。
+- `setRangeText()`：新文本替换选中的文本。该方法接受四个参数，第一个参数是新文本，第二个参数是替换的开始位置，第三个参数是结束位置，第四个参数表示替换后的行为（可选），有四个可能的值：`select`（选中新插入的文本）、`start`（光标位置移到插入的文本之前）、`end`（光标位置移到插入的文本之后）、`preserve`（默认值，如果原先就有文本被选中且本次替换位置与原先选中位置有交集，则被选择的文本为替换后的文本与原先被选择的文本，否则保留原先选中的文本）。
 - `setCustomValidity()`：该方法用于自定义校验失败时的报错信息。它的参数就是报错的提示信息。注意，一旦设置了自定义报错信息，该字段就不会校验通过了，因此用户重新输入时，必须将自定义报错信息设为空字符串，请看下面的例子。
 - `checkValidity()`：返回一个布尔值，表示当前节点的校验结果。如果返回`false`，表示不满足校验要求，否则就是校验成功或不必校验。
 - `stepDown()`：将当前`<input>`节点的值减少一个步长。该方法可以接受一个整数`n`作为参数，表示一次性减少`n`个步长，默认是`1`。有几种情况会抛错：当前`<input>`节点不适合递减或递增、当前节点没有`step`属性、`<input>`节点的值不能转为数字、递减之后的值小于`min`属性或大于`max`属性。

From aa4e3810be90a76071cef0b90027b6de6f89b740 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Fri, 16 Oct 2020 07:56:23 +0800
Subject: [PATCH 025/123] docs(oop/new): fix #200

---
 docs/oop/new.md   |  2 +-
 package-lock.json | 99 +++++++++++++++++++----------------------------
 2 files changed, 40 insertions(+), 61 deletions(-)

diff --git a/docs/oop/new.md b/docs/oop/new.md
index aad7aeb..aa1a8cb 100644
--- a/docs/oop/new.md
+++ b/docs/oop/new.md
@@ -16,7 +16,7 @@ JavaScript 语言具有很强的面向对象编程能力，本章介绍 JavaScri
 
 **（2）对象是一个容器，封装了属性（property）和方法（method）。**
 
-属性是对象的状态，方法是对象的行为（完成某种任务）。比如，我们可以把动物抽象为`animal`对象，使用“属性”记录具体是那一种动物，使用“方法”表示动物的某种行为（奔跑、捕猎、休息等等）。
+属性是对象的状态，方法是对象的行为（完成某种任务）。比如，我们可以把动物抽象为`animal`对象，使用“属性”记录具体是哪一种动物，使用“方法”表示动物的某种行为（奔跑、捕猎、休息等等）。
 
 ## 构造函数
 
diff --git a/package-lock.json b/package-lock.json
index be3471c..176bde4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -73,11 +73,6 @@
         }
       }
     },
-    "@types/color-name": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
-      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ=="
-    },
     "@types/minimatch": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
@@ -94,11 +89,10 @@
       "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg=="
     },
     "ansi-styles": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
-      "integrity": "sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
       "requires": {
-        "@types/color-name": "^1.1.1",
         "color-convert": "^2.0.1"
       }
     },
@@ -187,9 +181,9 @@
       }
     },
     "cliui": {
-      "version": "7.0.1",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.1.tgz",
-      "integrity": "sha512-rcvHOWyGyid6I1WjT/3NatKj2kDt9OdSHSXpyLXaMWFbKpGACNW8pRhhdPUq9MWUOdwn8Rz9AVETjF4105rZZQ==",
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.2.tgz",
+      "integrity": "sha512-lhpKkuUj67j5JgZIPZxLe7nSa4MQoojzRVWQyzMqBp2hBg6gwRjUDAwC1YDeBaC3APDBKNnjWbv2mlDF4XgOSA==",
       "requires": {
         "string-width": "^4.2.0",
         "strip-ansi": "^6.0.0",
@@ -273,11 +267,11 @@
       "integrity": "sha512-eyTcpKOcamdhWJXj56DpQMo1ylSQpcGtGKXcU0Tb97+K56/CF5amAqqqNj0+KvA0iw2ynxtHWFsPDSClCxe48w=="
     },
     "debug": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
-      "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.2.0.tgz",
+      "integrity": "sha512-IX2ncY78vDTjZMFUdmsvIRFY2Cf4FnD0wRs+nQwJU8Lu99/tPFdb0VybiiMTPe3I6rQmwsqQqRBvxU+bZ/I8sg==",
       "requires": {
-        "ms": "^2.1.1"
+        "ms": "2.1.2"
       },
       "dependencies": {
         "ms": {
@@ -379,9 +373,9 @@
       }
     },
     "escalade": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.0.tgz",
-      "integrity": "sha512-mAk+hPSO8fLDkhV7V0dXazH5pDc6MrjBTPyD3VeKzxnVFjH1MIxbCdqGZB9O8+EwWakZs3ZCbDS4IpRt79V1ig=="
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
+      "integrity": "sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw=="
     },
     "escape-html": {
       "version": "1.0.3",
@@ -556,9 +550,9 @@
       }
     },
     "graceful-fs": {
-      "version": "4.2.3",
-      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.3.tgz",
-      "integrity": "sha512-a30VEBm4PEdx1dRB7MFK7BejejvCvBronbLjht+sHuGYj8PHs7M/5Z+rt5lw551vZ7yfTCj4Vuyy3mSJytDWRQ=="
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.4.tgz",
+      "integrity": "sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw=="
     },
     "has-flag": {
       "version": "4.0.0",
@@ -571,9 +565,9 @@
       "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw=="
     },
     "highlight.js": {
-      "version": "10.2.0",
-      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-10.2.0.tgz",
-      "integrity": "sha512-OryzPiqqNCfO/wtFo619W+nPYALM6u7iCQkum4bqRmmlcTikOkmlL06i009QelynBPAlNByTQU6cBB2cOBQtCw=="
+      "version": "10.2.1",
+      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-10.2.1.tgz",
+      "integrity": "sha512-A+sckVPIb9zQTUydC9lpRX1qRFO/N0OKEh0NwIr65ckvWA/oMY8v9P3+kGRK3w2ULSh9E8v5MszXafodQ6039g=="
     },
     "html-minifier": {
       "version": "4.0.0",
@@ -746,9 +740,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.19",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.19.tgz",
-      "integrity": "sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ=="
+      "version": "4.17.20",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
+      "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA=="
     },
     "log-symbols": {
       "version": "4.0.0",
@@ -814,11 +808,6 @@
             "universalify": "^1.0.0"
           }
         },
-        "lodash": {
-          "version": "4.17.20",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
-          "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA=="
-        },
         "universalify": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/universalify/-/universalify-1.0.0.tgz",
@@ -847,13 +836,6 @@
       "integrity": "sha512-g3FeP20LNwhALb/6Cz6Dd4F2ngze0jz7tbzrD2wAV+o9FeNHe4rL+yK2md0J/fiSf1sa1ADhXqi5+oVwOM/eGw==",
       "requires": {
         "semver": "^6.0.0"
-      },
-      "dependencies": {
-        "semver": {
-          "version": "6.3.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
-        }
       }
     },
     "markdown-it": {
@@ -1151,19 +1133,11 @@
       "integrity": "sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw="
     },
     "promptly": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/promptly/-/promptly-3.0.3.tgz",
-      "integrity": "sha512-EWnzOsxVKUjqKeE6SStH1/cO4+DE44QolaoJ4ojGd9z6pcNkpgfJKr1ncwxrOFHSTIzoudo7jG8y0re30/LO1g==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/promptly/-/promptly-3.1.0.tgz",
+      "integrity": "sha512-ygvIcmkt+eWtrQwI1/w7wDfzfAWI7IJX1AUVsWQEQwTmpQ5jeSyiD1g6NuI9VXWhz8LK5a5Bcngp/sKnOgQtiA==",
       "requires": {
-        "pify": "^3.0.0",
         "read": "^1.0.4"
-      },
-      "dependencies": {
-        "pify": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
-          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY="
-        }
       }
     },
     "query-string": {
@@ -1223,6 +1197,11 @@
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
       "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
     },
+    "semver": {
+      "version": "6.3.0",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
+    },
     "semver-compare": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/semver-compare/-/semver-compare-1.0.0.tgz",
@@ -1448,9 +1427,9 @@
       "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA=="
     },
     "uglify-js": {
-      "version": "3.10.4",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.10.4.tgz",
-      "integrity": "sha512-kBFT3U4Dcj4/pJ52vfjCSfyLyvG9VYYuGYPmrPvAxRw/i7xHiT4VvCev+uiEMcEEiu6UNB6KgWmGtSUYIWScbw=="
+      "version": "3.11.2",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.11.2.tgz",
+      "integrity": "sha512-G440NU6fewtnQftSgqRV1r2A5ChKbU1gqFCJ7I8S7MPpY/eZZfLGefaY6gUZYiWebMaO+txgiQ1ZyLDuNWJulg=="
     },
     "universalify": {
       "version": "0.1.2",
@@ -1522,9 +1501,9 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "y18n": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.1.tgz",
-      "integrity": "sha512-/jJ831jEs4vGDbYPQp4yGKDYPSCCEQ45uZWJHE1AoYBzqdZi8+LDWas0z4HrmJXmKdpFsTiowSHXdxyFhpmdMg=="
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.2.tgz",
+      "integrity": "sha512-CkwaeZw6dQgqgPGeTWKMXCRmMcBgETFlTml1+ZOO+q7kGst8NREJ+eWwFNPVUQ4QGdAaklbqCZHH6Zuep1RjiA=="
     },
     "yaml": {
       "version": "1.10.0",
@@ -1546,9 +1525,9 @@
       }
     },
     "yargs-parser": {
-      "version": "20.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.0.0.tgz",
-      "integrity": "sha512-8eblPHTL7ZWRkyjIZJjnGf+TijiKJSwA24svzLRVvtgoi/RZiKa9fFQTrlx0OKLnyHSdt/enrdadji6WFfESVA=="
+      "version": "20.2.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.2.tgz",
+      "integrity": "sha512-XmrpXaTl6noDsf1dKpBuUNCOHqjs0g3jRMXf/ztRxdOmb+er8kE5z5b55Lz3p5u2T8KJ59ENBnASS8/iapVJ5g=="
     }
   }
 }

From 73384a2d47bfe8c919225f44eae68ae75753c4c9 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Fri, 16 Oct 2020 08:01:56 +0800
Subject: [PATCH 026/123] docs(oop/new): edit text

---
 docs/oop/new.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/oop/new.md b/docs/oop/new.md
index aa1a8cb..ae7d32d 100644
--- a/docs/oop/new.md
+++ b/docs/oop/new.md
@@ -12,7 +12,7 @@ JavaScript 语言具有很强的面向对象编程能力，本章介绍 JavaScri
 
 **（1）对象是单个实物的抽象。**
 
-一本书、一辆汽车、一个人都可以是对象，一个数据库、一张网页、一个与远程服务器的连接也可以是对象。当实物被抽象成对象，实物之间的关系就变成了对象之间的关系，从而就可以模拟现实情况，针对对象进行编程。
+一本书、一辆汽车、一个人都可以是对象，一个数据库、一张网页、一个远程服务器连接也可以是对象。当实物被抽象成对象，实物之间的关系就变成了对象之间的关系，从而就可以模拟现实情况，针对对象进行编程。
 
 **（2）对象是一个容器，封装了属性（property）和方法（method）。**
 
@@ -26,7 +26,7 @@ JavaScript 语言具有很强的面向对象编程能力，本章介绍 JavaScri
 
 JavaScript 语言使用构造函数（constructor）作为对象的模板。所谓”构造函数”，就是专门用来生成实例对象的函数。它就是对象的模板，描述实例对象的基本结构。一个构造函数，可以生成多个实例对象，这些实例对象都有相同的结构。
 
-构造函数就是一个普通的函数，但是有自己的特征和用法。
+构造函数就是一个普通的函数，但具有自己的特征和用法。
 
 ```javascript
 var Vehicle = function () {

From 9fe39f1fe22f0ca5f26f547d861c689571735c3c Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 17 Oct 2020 15:20:10 +0800
Subject: [PATCH 027/123] docs(elements): edit input/setRangeText

---
 docs/elements/input.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/elements/input.md b/docs/elements/input.md
index 5d76291..9a04e0e 100644
--- a/docs/elements/input.md
+++ b/docs/elements/input.md
@@ -84,7 +84,7 @@
 - `select()`：选中`<input>`元素内部的所有文本。该方法不能保证`<input>`获得焦点，最好先用`focus()`方法，再用这个方法。
 - `click()`：模拟鼠标点击当前的`<input>`元素。
 - `setSelectionRange()`：选中`<input>`元素内部的一段文本，但不会将焦点转移到选中的文本。该方法接受三个参数，第一个参数是开始的位置（从0开始），第二个参数是结束的位置（不包括该位置），第三个参数是可选的，表示选择的方向，有三个可能的值（`forward`、`backward`和默认值`none`）。
-- `setRangeText()`：新文本替换选中的文本。该方法接受四个参数，第一个参数是新文本，第二个参数是替换的开始位置，第三个参数是结束位置，第四个参数表示替换后的行为（可选），有四个可能的值：`select`（选中新插入的文本）、`start`（光标位置移到插入的文本之前）、`end`（光标位置移到插入的文本之后）、`preserve`（默认值，如果原先就有文本被选中且本次替换位置与原先选中位置有交集，则被选择的文本为替换后的文本与原先被选择的文本，否则保留原先选中的文本）。
+- `setRangeText()`：新文本替换选中的文本。该方法接受四个参数，第一个参数是新文本，第二个参数是替换的开始位置(从`0`开始计算)，第三个参数是结束位置（该位置不包括在内），第四个参数表示替换后的行为（可选），有四个可能的值：`select`（选中新插入的文本）、`start`（光标位置移到插入的文本之前）、`end`（光标位置移到插入的文本之后）、`preserve`（默认值，如果原先就有文本被选中且本次替换位置与原先选中位置有交集，则替换后同时选中新插入的文本与原先选中的文本，否则保持原先选中的文本）。
 - `setCustomValidity()`：该方法用于自定义校验失败时的报错信息。它的参数就是报错的提示信息。注意，一旦设置了自定义报错信息，该字段就不会校验通过了，因此用户重新输入时，必须将自定义报错信息设为空字符串，请看下面的例子。
 - `checkValidity()`：返回一个布尔值，表示当前节点的校验结果。如果返回`false`，表示不满足校验要求，否则就是校验成功或不必校验。
 - `stepDown()`：将当前`<input>`节点的值减少一个步长。该方法可以接受一个整数`n`作为参数，表示一次性减少`n`个步长，默认是`1`。有几种情况会抛错：当前`<input>`节点不适合递减或递增、当前节点没有`step`属性、`<input>`节点的值不能转为数字、递减之后的值小于`min`属性或大于`max`属性。

From 96fc3fe99d22d28fba493f98bb909c0413650f02 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 17 Oct 2020 20:10:36 +0800
Subject: [PATCH 028/123] docs(feature/conversion): fix typo #199

---
 docs/features/conversion.md | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/docs/features/conversion.md b/docs/features/conversion.md
index deea015..f495f4b 100644
--- a/docs/features/conversion.md
+++ b/docs/features/conversion.md
@@ -322,13 +322,13 @@ if ('abc') {
 - [1, 2, 3] // NaN
 ```
 
-自动转换的规则是这样的：预期什么类型的值，就调用该类型的转换函数。比如，某个位置预期为字符串，就调用`String`函数进行转换。如果该位置即可以是字符串，也可能是数值，那么默认转为数值。
+自动转换的规则是这样的：预期什么类型的值，就调用该类型的转换函数。比如，某个位置预期为字符串，就调用`String()`函数进行转换。如果该位置既可以是字符串，也可能是数值，那么默认转为数值。
 
-由于自动转换具有不确定性，而且不易除错，建议在预期为布尔值、数值、字符串的地方，全部使用`Boolean`、`Number`和`String`函数进行显式转换。
+由于自动转换具有不确定性，而且不易除错，建议在预期为布尔值、数值、字符串的地方，全部使用`Boolean()`、`Number()`和`String()`函数进行显式转换。
 
 ### 自动转换为布尔值
 
-JavaScript 遇到预期为布尔值的地方（比如`if`语句的条件部分），就会将非布尔值的参数自动转换为布尔值。系统内部会自动调用`Boolean`函数。
+JavaScript 遇到预期为布尔值的地方（比如`if`语句的条件部分），就会将非布尔值的参数自动转换为布尔值。系统内部会自动调用`Boolean()`函数。
 
 因此除了以下五个值，其他都是自动转为`true`。
 
@@ -351,7 +351,7 @@ if ( !undefined
 } // true
 ```
 
-下面两种写法，有时也用于将一个表达式转为布尔值。它们内部调用的也是`Boolean`函数。
+下面两种写法，有时也用于将一个表达式转为布尔值。它们内部调用的也是`Boolean()`函数。
 
 ```javascript
 // 写法一
@@ -392,7 +392,7 @@ obj.width + 20 // "10020"
 
 ### 自动转换为数值
 
-JavaScript 遇到预期为数值的地方，就会将参数值自动转换为数值。系统内部会自动调用`Number`函数。
+JavaScript 遇到预期为数值的地方，就会将参数值自动转换为数值。系统内部会自动调用`Number()`函数。
 
 除了加法运算符（`+`）有可能把运算子转为字符串，其他运算符都会把运算子自动转成数值。
 

From 95e0e1ae395ab7dcc1141df2d397c54558d5efc1 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 24 Oct 2020 07:28:50 +0800
Subject: [PATCH 029/123] docs(events): edit paste event

---
 docs/events/common.md | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/docs/events/common.md b/docs/events/common.md
index 7acb5bc..c1d7b98 100644
--- a/docs/events/common.md
+++ b/docs/events/common.md
@@ -303,7 +303,15 @@ document.addEventListener('fullscreenchange', function (event) {
 - `copy`：进行复制动作时触发。
 - `paste`：剪贴板内容粘贴到文档后触发。
 
-这三个事件都是`ClipboardEvent`接口的实例。`ClipboardEvent`有一个实例属性`clipboardData`，是一个 DataTransfer 对象，存放剪贴的数据。具体的 API 接口和操作方法，请参见《拖拉事件》的 DataTransfer 对象部分。
+举例来说，如果希望禁止输入框的粘贴事件，可以使用下面的代码。
+
+```javascript
+inputElement.addEventListener（'paste'，e => e.preventDefault（））;
+```
+
+上面的代码使得用户无法在`<input>`输入框里面粘贴内容。
+
+`cut`、`copy`、`paste`这三个事件的事件对象都是`ClipboardEvent`接口的实例。`ClipboardEvent`有一个实例属性`clipboardData`，是一个 DataTransfer 对象，存放剪贴的数据。具体的 API 接口和操作方法，请参见《拖拉事件》的 DataTransfer 对象部分。
 
 ```javascript
 document.addEventListener('copy', function (e) {
@@ -324,7 +332,7 @@ document.addEventListener('copy', function (e) {
 - `focusin`：元素节点将要获得焦点时触发，发生在`focus`事件之前。该事件会冒泡。
 - `focusout`：元素节点将要失去焦点时触发，发生在`blur`事件之前。该事件会冒泡。
 
-这四个事件都继承了`FocusEvent`接口。`FocusEvent`实例具有以下属性。
+这四个事件的事件对象都继承了`FocusEvent`接口。`FocusEvent`实例具有以下属性。
 
 - `FocusEvent.target`：事件的目标节点。
 - `FocusEvent.relatedTarget`：对于`focusin`事件，返回失去焦点的节点；对于`focusout`事件，返回将要接受焦点的节点；对于`focus`和`blur`事件，返回`null`。

From 025dd71c73eb90c4e6a1508bdb75262deb1dc8ea Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 24 Oct 2020 09:28:38 +0800
Subject: [PATCH 030/123] docs(events): edit paste event

---
 docs/events/common.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/events/common.md b/docs/events/common.md
index c1d7b98..b89f092 100644
--- a/docs/events/common.md
+++ b/docs/events/common.md
@@ -306,7 +306,7 @@ document.addEventListener('fullscreenchange', function (event) {
 举例来说，如果希望禁止输入框的粘贴事件，可以使用下面的代码。
 
 ```javascript
-inputElement.addEventListener（'paste'，e => e.preventDefault（））;
+inputElement.addEventListener('paste', e => e.preventDefault());
 ```
 
 上面的代码使得用户无法在`<input>`输入框里面粘贴内容。

From aaa117a6635c4d588cdb9f6668ecc9c1dcd65798 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 27 Oct 2020 18:34:45 +0800
Subject: [PATCH 031/123] docs(elements/video): fix #201

---
 docs/elements/video.md | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/docs/elements/video.md b/docs/elements/video.md
index 6e62499..1625b70 100644
--- a/docs/elements/video.md
+++ b/docs/elements/video.md
@@ -66,7 +66,7 @@
 
 - HTMLMediaElement.addTextTrack()：添加文本轨道（比如字幕）到媒体文件。
 - HTMLMediaElement.captureStream()：返回一个 MediaStream 对象，用来捕获当前媒体文件的流内容。
-- HTMLMediaElement.canPlayType()：该方法接受一个 MIME 字符串作为参数，用来判断这种类型的媒体文件是否可以播放。该反复返回一个字符串，有三种可能的值，`probably`表示似乎可播放，`maybe`表示无法在不播放的情况下判断是否可播放，空字符串表示无法播放。
+- HTMLMediaElement.canPlayType()：该方法接受一个 MIME 字符串作为参数，用来判断这种类型的媒体文件是否可以播放。该方法返回一个字符串，有三种可能的值，`probably`表示似乎可播放，`maybe`表示无法在不播放的情况下判断是否可播放，空字符串表示无法播放。
 - HTMLMediaElement.fastSeek()：该方法接受一个浮点数作为参数，表示指定的时间（单位秒）。该方法将媒体文件移动到指定时间。
 - HTMLMediaElement.load()：重新加载媒体文件。
 - HTMLMediaElement.pause()：暂停播放。该方法没有返回值。
@@ -101,7 +101,7 @@ HTMLVideoElement 接口的属性。
 
 HTMLVideoElement 接口的方法。
 
-- HTMLVideoElement.getVideoPlaybackQuality()：返回一个对象，包含了当前视频回访的一些数据。
+- HTMLVideoElement.getVideoPlaybackQuality()：返回一个对象，包含了当前视频回放的一些数据。
 
 ## HTMLAudioElement 接口
 
@@ -146,8 +146,9 @@ if (a.canPlayType('audio/wav')) {
 - seeked：`seeking`属性变回`false`时触发。
 - ended：媒体文件播放完毕时触发。
 - durationchange：`duration`属性变化时触发。
-- volumechange：音量变回或者静音时触发。
+- volumechange：音量变化时触发。
 - ratechange：播放速度或默认的播放速度变化时触发。
 - abort：停止加载媒体文件时触发，通常是用户主动要求停止下载。
 - error：网络或其他原因导致媒体文件无法加载时触发。
 - emptied：由于`error`或`abort`事件导致`networkState`属性变成无法获取数据时触发。
+

From cce2da1b5191aefc5e7444f08e65954f32de6868 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 27 Oct 2020 19:05:02 +0800
Subject: [PATCH 032/123] docs(oop/object): edit Object.create()

---
 docs/oop/object.md | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/docs/oop/object.md b/docs/oop/object.md
index f376b16..a7e0340 100644
--- a/docs/oop/object.md
+++ b/docs/oop/object.md
@@ -62,7 +62,7 @@ F.call(f);
 
 生成实例对象的常用方法是，使用`new`命令让构造函数返回一个实例。但是很多时候，只能拿到一个实例对象，它可能根本不是由构建函数生成的，那么能不能从一个实例对象，生成另一个实例对象呢？
 
-JavaScript 提供了`Object.create`方法，用来满足这种需求。该方法接受一个对象作为参数，然后以它为原型，返回一个实例对象。该实例完全继承原型对象的属性。
+JavaScript 提供了`Object.create()`方法，用来满足这种需求。该方法接受一个对象作为参数，然后以它为原型，返回一个实例对象。该实例完全继承原型对象的属性。
 
 ```javascript
 // 原型对象
@@ -80,9 +80,9 @@ B.print() // hello
 B.print === A.print // true
 ```
 
-上面代码中，`Object.create`方法以`A`对象为原型，生成了`B`对象。`B`继承了`A`的所有属性和方法。
+上面代码中，`Object.create()`方法以`A`对象为原型，生成了`B`对象。`B`继承了`A`的所有属性和方法。
 
-实际上，`Object.create`方法可以用下面的代码代替。
+实际上，`Object.create()`方法可以用下面的代码代替。
 
 ```javascript
 if (typeof Object.create !== 'function') {
@@ -94,7 +94,7 @@ if (typeof Object.create !== 'function') {
 }
 ```
 
-上面代码表明，`Object.create`方法的实质是新建一个空的构造函数`F`，然后让`F.prototype`属性指向参数对象`obj`，最后返回一个`F`的实例，从而实现让该实例继承`obj`的属性。
+上面代码表明，`Object.create()`方法的实质是新建一个空的构造函数`F`，然后让`F.prototype`属性指向参数对象`obj`，最后返回一个`F`的实例，从而实现让该实例继承`obj`的属性。
 
 下面三种方式生成的新对象是等价的。
 
@@ -104,7 +104,7 @@ var obj2 = Object.create(Object.prototype);
 var obj3 = new Object();
 ```
 
-如果想要生成一个不继承任何属性（比如没有`toString`和`valueOf`方法）的对象，可以将`Object.create`的参数设为`null`。
+如果想要生成一个不继承任何属性（比如没有`toString()`和`valueOf()`方法）的对象，可以将`Object.create()`的参数设为`null`。
 
 ```javascript
 var obj = Object.create(null);
@@ -113,9 +113,9 @@ obj.valueOf()
 // TypeError: Object [object Object] has no method 'valueOf'
 ```
 
-上面代码中，对象`obj`的原型是`null`，它就不具备一些定义在`Object.prototype`对象上面的属性，比如`valueOf`方法。
+上面代码中，对象`obj`的原型是`null`，它就不具备一些定义在`Object.prototype`对象上面的属性，比如`valueOf()`方法。
 
-使用`Object.create`方法的时候，必须提供对象原型，即参数不能为空，或者不是对象，否则会报错。
+使用`Object.create()`方法的时候，必须提供对象原型，即参数不能为空，或者不是对象，否则会报错。
 
 ```javascript
 Object.create()
@@ -124,7 +124,7 @@ Object.create(123)
 // TypeError: Object prototype may only be an Object or null
 ```
 
-`Object.create`方法生成的新对象，动态继承了原型。在原型上添加或修改任何方法，会立刻反映在新对象之上。
+`Object.create()`方法生成的新对象，动态继承了原型。在原型上添加或修改任何方法，会立刻反映在新对象之上。
 
 ```javascript
 var obj1 = { p: 1 };
@@ -136,7 +136,7 @@ obj2.p // 2
 
 上面代码中，修改对象原型`obj1`会影响到实例对象`obj2`。
 
-除了对象的原型，`Object.create`方法还可以接受第二个参数。该参数是一个属性描述对象，它所描述的对象属性，会添加到实例对象，作为该对象自身的属性。
+除了对象的原型，`Object.create()`方法还可以接受第二个参数。该参数是一个属性描述对象，它所描述的对象属性，会添加到实例对象，作为该对象自身的属性。
 
 ```javascript
 var obj = Object.create({}, {
@@ -160,7 +160,7 @@ obj.p1 = 123;
 obj.p2 = 'abc';
 ```
 
-`Object.create`方法生成的对象，继承了它的原型对象的构造函数。
+`Object.create()`方法生成的对象，继承了它的原型对象的构造函数。
 
 ```javascript
 function A() {}

From 78e09da825708f2083e1a1a8470e6ac6d96c33d6 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 5 Nov 2020 22:35:35 +0800
Subject: [PATCH 033/123] docs(oop/prototype/instanceof): fix #203

---
 docs/oop/prototype.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/docs/oop/prototype.md b/docs/oop/prototype.md
index f01c701..6efc2bb 100644
--- a/docs/oop/prototype.md
+++ b/docs/oop/prototype.md
@@ -262,7 +262,7 @@ v instanceof Vehicle // true
 
 上面代码中，对象`v`是构造函数`Vehicle`的实例，所以返回`true`。
 
-`instanceof`运算符的左边是实例对象，右边是构造函数。它会检查右边构建函数的原型对象（prototype），是否在左边对象的原型链上。因此，下面两种写法是等价的。
+`instanceof`运算符的左边是实例对象，右边是构造函数。它会检查右边构造函数的原型对象（prototype），是否在左边对象的原型链上。因此，下面两种写法是等价的。
 
 ```javascript
 v instanceof Vehicle
@@ -270,7 +270,7 @@ v instanceof Vehicle
 Vehicle.prototype.isPrototypeOf(v)
 ```
 
-上面代码中，`Object.prototype.isPrototypeOf`的详细解释见后文。
+上面代码中，`Object`是对象的构造函数，它的原型对象是`Object.prototype`，`isPrototypeOf()`方法用于检查某个对象是否为另一个对象的原型，详细解释见后文。
 
 由于`instanceof`检查整个原型链，因此同一个实例对象，可能会对多个构造函数都返回`true`。
 
@@ -298,10 +298,10 @@ null instanceof Object // false
 ```javascript
 var obj = Object.create(null);
 typeof obj // "object"
-Object.create(null) instanceof Object // false
+obj instanceof Object // false
 ```
 
-上面代码中，`Object.create(null)`返回一个新对象`obj`，它的原型是`null`（`Object.create`的详细介绍见后文）。右边的构造函数`Object`的`prototype`属性，不在左边的原型链上，因此`instanceof`就认为`obj`不是`Object`的实例。但是，只要一个对象的原型不是`null`，`instanceof`运算符的判断就不会失真。
+上面代码中，`Object.create(null)`返回一个新对象`obj`，它的原型是`null`（`Object.create()`的详细介绍见后文）。右边的构造函数`Object`的`prototype`属性，不在左边的原型链上，因此`instanceof`就认为`obj`不是`Object`的实例。这是唯一的`instanceof`运算符判断会失真的情况（一个对象的原型是`null`）。
 
 `instanceof`运算符的一个用处，是判断值的类型。
 

From 3898d66a7001e2fc72db7392715af874c2c8ed97 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Fri, 6 Nov 2020 23:20:37 +0800
Subject: [PATCH 034/123] docs(oop/prototype): fix typo

---
 docs/oop/prototype.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/oop/prototype.md b/docs/oop/prototype.md
index 6efc2bb..76077e2 100644
--- a/docs/oop/prototype.md
+++ b/docs/oop/prototype.md
@@ -270,7 +270,7 @@ v instanceof Vehicle
 Vehicle.prototype.isPrototypeOf(v)
 ```
 
-上面代码中，`Object`是对象的构造函数，它的原型对象是`Object.prototype`，`isPrototypeOf()`方法用于检查某个对象是否为另一个对象的原型，详细解释见后文。
+上面代码中，`Vehicle`是对象`v`的构造函数，它的原型对象是`Vehicle.prototype`，`isPrototypeOf()`方法是 JavaScript 提供的原生方法，用于检查某个对象是否为另一个对象的原型，详细解释见后文。
 
 由于`instanceof`检查整个原型链，因此同一个实例对象，可能会对多个构造函数都返回`true`。
 

From ce1ed097ff1476a2be8eb5868420fce92171d0a5 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 2 Dec 2020 04:23:01 +0800
Subject: [PATCH 035/123] docs(dom): edit parentNode

---
 docs/dom/parentnode.md | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/docs/dom/parentnode.md b/docs/dom/parentnode.md
index 1aa2d0c..813ee3e 100644
--- a/docs/dom/parentnode.md
+++ b/docs/dom/parentnode.md
@@ -54,9 +54,11 @@ document.body.childElementCount // 13
 
 ### ParentNode.append()，ParentNode.prepend()
 
-`append`方法为当前节点追加一个或多个子节点，位置是最后一个元素子节点的后面。
+**（1）ParentNode.append()**
 
-该方法不仅可以添加元素子节点，还可以添加文本子节点。
+`append()`方法为当前节点追加一个或多个子节点，位置是最后一个元素子节点的后面。
+
+该方法不仅可以添加元素子节点（参数为元素节点），还可以添加文本子节点（参数为字符串）。
 
 ```javascript
 var parent = document.body;
@@ -78,9 +80,17 @@ var p = document.createElement('p');
 parent.append('Hello', p);
 ```
 
-注意，该方法没有返回值。
+该方法没有返回值。
+
+注意，该方法与`Node.prototype.appendChild()`方法有三点不同。
+
+- `append()`允许字符串作为参数，`appendChild()`只允许接受子节点作为参数。
+- `append()`没有返回值，而`appendChild()`返回添加的子节点。
+- `append()`可以附加多个子节点和字符串（即允许多个参数），`appendChild()`只能添加一个节点（即只能有一个参数）。
+
+**（2）ParentNode.prepend()**
 
-`prepend`方法为当前节点追加一个或多个子节点，位置是第一个元素子节点的前面。它的用法与`append`方法完全一致，也是没有返回值。
+`prepend()`方法为当前节点追加一个或多个子节点，位置是第一个元素子节点的前面。它的用法与`append()`方法完全一致，也是没有返回值。
 
 ## ChildNode 接口
 
@@ -88,7 +98,7 @@ parent.append('Hello', p);
 
 ### ChildNode.remove()
 
-`remove`方法用于从父节点移除当前节点。
+`remove()`方法用于从父节点移除当前节点。
 
 ```javascript
 el.remove()
@@ -98,7 +108,9 @@ el.remove()
 
 ### ChildNode.before()，ChildNode.after()
 
-`before`方法用于在当前节点的前面，插入一个或多个同级节点。两者拥有相同的父节点。
+**（1）ChildNode.before()**
+
+`before()`方法用于在当前节点的前面，插入一个或多个同级节点。两者拥有相同的父节点。
 
 注意，该方法不仅可以插入元素节点，还可以插入文本节点。
 
@@ -119,11 +131,13 @@ el.before(p, p1);
 el.before(p, 'Hello');
 ```
 
-`after`方法用于在当前节点的后面，插入一个或多个同级节点，两者拥有相同的父节点。用法与`before`方法完全相同。
+**（2）ChildNode.after()**
+
+`after()`方法用于在当前节点的后面，插入一个或多个同级节点，两者拥有相同的父节点。用法与`before`方法完全相同。
 
 ### ChildNode.replaceWith()
 
-`replaceWith`方法使用参数节点，替换当前节点。参数可以是元素节点，也可以是文本节点。
+`replaceWith()`方法使用参数节点，替换当前节点。参数可以是元素节点，也可以是文本节点。
 
 ```javascript
 var span = document.createElement('span');
@@ -131,3 +145,4 @@ el.replaceWith(span);
 ```
 
 上面代码中，`el`节点将被`span`节点替换。
+

From 2403863fc424387520ccc5f94fdde39453c5b519 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 2 Dec 2020 04:29:00 +0800
Subject: [PATCH 036/123] docs(dom): edit parentNode

---
 docs/dom/parentnode.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/dom/parentnode.md b/docs/dom/parentnode.md
index 813ee3e..a4183a1 100644
--- a/docs/dom/parentnode.md
+++ b/docs/dom/parentnode.md
@@ -84,9 +84,9 @@ parent.append('Hello', p);
 
 注意，该方法与`Node.prototype.appendChild()`方法有三点不同。
 
-- `append()`允许字符串作为参数，`appendChild()`只允许接受子节点作为参数。
+- `append()`允许字符串作为参数，`appendChild()`只允许子节点作为参数。
 - `append()`没有返回值，而`appendChild()`返回添加的子节点。
-- `append()`可以附加多个子节点和字符串（即允许多个参数），`appendChild()`只能添加一个节点（即只能有一个参数）。
+- `append()`可以添加多个子节点和字符串（即允许多个参数），`appendChild()`只能添加一个节点（即只允许一个参数）。
 
 **（2）ParentNode.prepend()**
 

From 75a986b194a8ef8ae684de767b985412c3682cb8 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 2 Dec 2020 12:00:16 +0800
Subject: [PATCH 037/123] docs(types/function): edit closure #204

---
 docs/types/function.md | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index 82c3e0c..98811c8 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -277,6 +277,8 @@ f.toString()
 // }
 ```
 
+上面示例中，函数`f`的`toString()`方法返回了`f`的源码，包含换行符在内。
+
 对于那些原生的函数，`toString()`方法返回`function (){[native code]}`。
 
 ```javascript
@@ -319,6 +321,8 @@ multiline(f);
 //   多行注释"
 ```
 
+上面示例中，函数`f`内部有一个多行注释，`toString()`方法拿到`f`的源码后，去掉首尾两行，就得到了一个多行字符串。
+
 ## 函数作用域
 
 ### 定义
@@ -740,7 +744,7 @@ result(); // 999
 
 闭包就是函数`f2`，即能够读取其他函数内部变量的函数。由于在 JavaScript 语言中，只有函数内部的子函数才能读取内部变量，因此可以把闭包简单理解成“定义在一个函数内部的函数”。闭包最大的特点，就是它可以“记住”诞生的环境，比如`f2`记住了它诞生的环境`f1`，所以从`f2`可以得到`f1`的内部变量。在本质上，闭包就是将函数内部和函数外部连接起来的一座桥梁。
 
-闭包的最大用处有两个，一个是可以读取函数内部的变量，另一个就是让这些变量始终保持在内存中，即闭包可以使得它诞生环境一直存在。请看下面的例子，闭包使得内部变量记住上一次调用时的运算结果。
+闭包的最大用处有两个，一个是可以读取外层函数内部的变量，另一个就是让这些变量始终保持在内存中，即闭包可以使得它诞生环境一直存在。请看下面的例子，闭包使得内部变量记住上一次调用时的运算结果。
 
 ```javascript
 function createIncrementor(start) {
@@ -758,7 +762,7 @@ inc() // 7
 
 上面代码中，`start`是函数`createIncrementor`的内部变量。通过闭包，`start`的状态被保留了，每一次调用都是在上一次调用的基础上进行计算。从中可以看到，闭包`inc`使得函数`createIncrementor`的内部环境，一直存在。所以，闭包可以看作是函数内部作用域的一个接口。
 
-为什么会这样呢？原因就在于`inc`始终在内存中，而`inc`的存在依赖于`createIncrementor`，因此也始终在内存中，不会在调用结束后，被垃圾回收机制回收。
+为什么闭包能够返回外层函数的内部变量？原因是闭包（上例的`inc`）用到了外层变量（`start`），导致外层函数（`createIncrementor`）不能从内存释放。只要闭包没有被垃圾回收机制清除，外层函数提供的运行环境也不会被清除，它的内部变量就始终保存着当前值，供闭包读取。
 
 闭包的另一个用处，是封装对象的私有属性和私有方法。
 

From d1a2ff053d90e8114fc13c8484d307e098b584a2 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 9 Dec 2020 13:53:19 +0800
Subject: [PATCH 038/123] refactor: update dependencies

---
 package-lock.json | 12 ++++++------
 package.json      |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 176bde4..e433feb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -629,9 +629,9 @@
       }
     },
     "husky": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.0.tgz",
-      "integrity": "sha512-tTMeLCLqSBqnflBZnlVDhpaIMucSGaYyX6855jM4AguGeWCeSzNdb1mfyWduTZ3pe3SJVvVWGL0jO1iKZVPfTA==",
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.5.tgz",
+      "integrity": "sha512-E5S/1HMoDDaqsH8kDF5zeKEQbYqe3wL9zJDyqyYqc8I4vHBtAoxkDBGXox0lZ9RI+k5GyB728vZdmnM4bYap+g==",
       "requires": {
         "chalk": "^4.0.0",
         "ci-info": "^2.0.0",
@@ -646,9 +646,9 @@
       }
     },
     "import-fresh": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.2.1.tgz",
-      "integrity": "sha512-6e1q1cnWP2RXD9/keSkxHScg508CdXqXWgWBaETNhyuBFz+kUZlKboh+ISK+bU++DmbHimVBrOz/zzPe0sZ3sQ==",
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.2.2.tgz",
+      "integrity": "sha512-cTPNrlvJT6twpYy+YmKUKrTSjWFs3bjYjAhCwm+z4EOCubZxAuO+hHpRN64TqjEaYSHs7tJAE0w1CKMGmsG/lw==",
       "requires": {
         "parent-module": "^1.0.0",
         "resolve-from": "^4.0.0"
diff --git a/package.json b/package.json
index e2fb260..b787c4f 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
     "gh-pages": "^3.1.0",
-    "husky": "^4.3.0",
+    "husky": "^4.3.5",
     "loppo": "^0.6.20",
     "loppo-theme-wangdoc": "^0.4.6"
   }

From 7094b33428c84c131b437ad76826e99bdd0858f7 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 9 Dec 2020 13:56:05 +0800
Subject: [PATCH 039/123] docs(bom/arraybuffer): fix #206

---
 docs/bom/arraybuffer.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/bom/arraybuffer.md b/docs/bom/arraybuffer.md
index 1ad0e2b..89a5ddd 100644
--- a/docs/bom/arraybuffer.md
+++ b/docs/bom/arraybuffer.md
@@ -164,8 +164,8 @@ FileReader 对象提供四个方法，处理 Blob 对象。Blob 对象作为参
 
 ```javascript
 // HTML 代码如下
-// <input type=’file' onchange='readfile(this.files[0])'></input>
-// <pre id='output'></pre>
+// <input type="file" onchange="readfile(this.files[0])"></input>
+// <pre id="output"></pre>
 function readfile(f) {
   var reader = new FileReader();
   reader.readAsText(f);
@@ -210,3 +210,4 @@ function typefile(file) {
   };
 }
 ```
+

From d9040700c1392b809338e8ef4d6918abecb3c954 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 16 Dec 2020 16:57:01 +0800
Subject: [PATCH 040/123] docs(bom/webworker): fix #207

---
 docs/bom/webworker.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/docs/bom/webworker.md b/docs/bom/webworker.md
index 618f197..d005a8b 100644
--- a/docs/bom/webworker.md
+++ b/docs/bom/webworker.md
@@ -142,11 +142,11 @@ importScripts('script1.js', 'script2.js');
 主线程可以监听 Worker 是否发生错误。如果发生错误，Worker 会触发主线程的`error`事件。
 
 ```javascript
-worker.onerror(function (event) {
-  console.log([
+worker.onerror = function (event) {
+  console.log(
     'ERROR: Line ', event.lineno, ' in ', event.filename, ': ', event.message
-  ].join(''));
-});
+  );
+};
 
 // 或者
 worker.addEventListener('error', function (event) {

From 581793501e20e3a3c9c3d30d2ef4c919ac5ce94d Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 16 Dec 2020 16:57:55 +0800
Subject: [PATCH 041/123] refactor: update dependencies

---
 package-lock.json | 18 +++++++++---------
 package.json      |  2 +-
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index e433feb..d742dc0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,17 +5,17 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.10.4",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
-      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
+      "integrity": "sha512-Zt1yodBx1UcyiePMSkWnU4hPqhwq7hGi2nFL1LeA3EUl+q2LQx16MISgJ0+z7dnmgvP9QtIleuETGOiOH1RcIw==",
       "requires": {
         "@babel/highlight": "^7.10.4"
       }
     },
     "@babel/helper-validator-identifier": {
-      "version": "7.10.4",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
-      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw=="
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
+      "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw=="
     },
     "@babel/highlight": {
       "version": "7.10.4",
@@ -629,9 +629,9 @@
       }
     },
     "husky": {
-      "version": "4.3.5",
-      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.5.tgz",
-      "integrity": "sha512-E5S/1HMoDDaqsH8kDF5zeKEQbYqe3wL9zJDyqyYqc8I4vHBtAoxkDBGXox0lZ9RI+k5GyB728vZdmnM4bYap+g==",
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.6.tgz",
+      "integrity": "sha512-o6UjVI8xtlWRL5395iWq9LKDyp/9TE7XMOTvIpEVzW638UcGxTmV5cfel6fsk/jbZSTlvfGVJf2svFtybcIZag==",
       "requires": {
         "chalk": "^4.0.0",
         "ci-info": "^2.0.0",
diff --git a/package.json b/package.json
index b787c4f..9afffe5 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
     "gh-pages": "^3.1.0",
-    "husky": "^4.3.5",
+    "husky": "^4.3.6",
     "loppo": "^0.6.20",
     "loppo-theme-wangdoc": "^0.4.6"
   }

From 534b91337dd54de2d671beed035edd75959b33be Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 19 Dec 2020 00:33:10 +0800
Subject: [PATCH 042/123] feat: switch CI from Travis-CI to GitHub Actions

---
 .github/workflows/wangdoc.yml  | 37 +++++++++++++++++
 .travis.yml => .travis.yml.bak |  0
 docs/bom/navigator.md          | 72 +++++++++++++++++++++++++++++++++-
 3 files changed, 107 insertions(+), 2 deletions(-)
 create mode 100644 .github/workflows/wangdoc.yml
 rename .travis.yml => .travis.yml.bak (100%)

diff --git a/.github/workflows/wangdoc.yml b/.github/workflows/wangdoc.yml
new file mode 100644
index 0000000..80f8bfe
--- /dev/null
+++ b/.github/workflows/wangdoc.yml
@@ -0,0 +1,37 @@
+name: JavaScript tutorial CI
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  page-generator:
+    name: Generating pages
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+      - name: Setup Node.js
+        uses: actions/setup-node@main
+        with:
+          node-version: '14'
+      - name: Install dependencies
+        run: npm install
+      - name: Build pages
+        run: npm run build
+      - name: Deploy to website
+        uses: JamesIves/github-pages-deploy-action@3.7.1
+        with:
+          GIT_CONFIG_NAME: wangdoc-bot
+          GIT_CONFIG_EMAIL: yifeng.ruan@gmail.com
+          REPOSITORY_NAME: wangdoc/website
+          ACCESS_TOKEN: ${{ secrets.WANGDOC_BOT_TOKEN }}
+          BASE_BRANCH: master
+          BRANCH: master # The branch the action should deploy to.
+          FOLDER: dist # The folder the action should deploy.
+          TARGET_FOLDER: dist/javascript
+          CLEAN: true # Automatically remove deleted files from the deploy branch
+          COMMIT_MESSAGE: update from JavaScript tutorial
+
diff --git a/.travis.yml b/.travis.yml.bak
similarity index 100%
rename from .travis.yml
rename to .travis.yml.bak
diff --git a/docs/bom/navigator.md b/docs/bom/navigator.md
index f0644e4..0a92794 100644
--- a/docs/bom/navigator.md
+++ b/docs/bom/navigator.md
@@ -106,7 +106,7 @@ Geolocation 对象提供下面三个方法。
 
 ### Navigator.cookieEnabled
 
-`Navigator.cookieEnabled`属性返回一个布尔值，表示浏览器的 Cookie 功能是否打开。
+`navigator.cookieEnabled`属性返回一个布尔值，表示浏览器的 Cookie 功能是否打开。
 
 ```javascript
 navigator.cookieEnabled // true
@@ -118,7 +118,7 @@ navigator.cookieEnabled // true
 
 ### Navigator.javaEnabled()
 
-`Navigator.javaEnabled()`方法返回一个布尔值，表示浏览器是否能运行 Java Applet 小程序。
+`navigator.javaEnabled()`方法返回一个布尔值，表示浏览器是否能运行 Java Applet 小程序。
 
 ```javascript
 navigator.javaEnabled() // false
@@ -128,6 +128,73 @@ navigator.javaEnabled() // false
 
 `Navigator.sendBeacon()`方法用于向服务器异步发送数据，详见《XMLHttpRequest 对象》一章。
 
+## Navigator 的实验性属性
+
+Navigator 对象有一些实验性属性，在部分浏览器可用。
+
+### Navigator.deviceMemory
+
+`navigator.deviceMemory`属性返回当前计算机的内存数量（单位为 GB）。该属性只读，只在 HTTPS 环境下可用。
+
+它的返回值是一个近似值，四舍五入到最接近的2的幂，通常是 0.25、0.5、1、2、4、8。实际内存超过 8GB，也返回`8`。
+
+```javascript
+if (navigator.deviceMemory > 1) {
+  await import('./costly-module.js');
+}
+```
+
+上面示例中，只有当前内存大于 1GB，才加载大型的脚本。
+
+### Navigator.hardwareConcurrency
+
+`navigator.hardwareConcurrency`属性返回用户计算机上可用的逻辑处理器的数量。该属性只读。
+
+现代计算机的 CPU 有多个物理核心，每个物理核心有时支持一次运行多个线程。因此，四核 CPU 可以提供八个逻辑处理器核心。
+
+```javascript
+if (navigator.hardwareConcurrency > 4) {
+  await import('./costly-module.js');
+}
+```
+
+上面示例中，可用的逻辑处理器大于4，才会加载大型脚本。
+
+该属性通过用于创建 Web Worker，每个可用的逻辑处理器都创建一个 Worker。
+
+```javascript
+let workerList = [];
+
+for (let i = 0; i < window.navigator.hardwareConcurrency; i++) {
+  let newWorker = {
+    worker: new Worker('cpuworker.js'),
+    inUse: false
+  };
+  workerList.push(newWorker);
+}
+```
+
+上面示例中，有多少个可用的逻辑处理器，就创建多少个 Web Worker。
+
+### Navigator.connection
+
+`navigator.connection`属性返回一个对象，包含当前网络连接的相关信息。
+
+- downlink：有效带宽估计值（单位：兆比特/秒，Mbps），四舍五入到每秒 25KB 的最接近倍数。
+- downlinkMax：当前连接的最大下行链路速度（单位：兆比特每秒，Mbps）。
+- effectiveType：返回连接的等效类型，可能的值为`slow-2g`、`2g`、`3g`、`4g`。
+- rtt：当前连接的估计有效往返时间，四舍五入到最接近的25毫秒的倍数。
+- saveData：用户是否设置了浏览器的减少数据使用量选项（比如不加载图片），返回`true`或者`false`。
+- type：当前连接的介质类型，可能的值为`bluetooth`、`cellular`、`ethernet`、`none`、`wifi`、`wimax`、`other`、`unknown`。
+
+```javascript
+if (navigator.connection.effectiveType === '4g') {
+  await import('./costly-module.js');
+}
+```
+
+上面示例中，如果网络连接是 4G，则加载大型脚本。
+
 ## Screen 对象
 
 Screen 对象表示当前窗口所在的屏幕，提供显示设备的信息。`window.screen`属性指向这个对象。
@@ -166,3 +233,4 @@ if ((screen.width <= 800) && (screen.height <= 600)) {
   window.location.replace('wide.html');
 }
 ```
+

From 6f22958aca904064b8e0b618d86aa728929ccfe8 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 19 Dec 2020 00:44:37 +0800
Subject: [PATCH 043/123] refactor: update dependencies

---
 package-lock.json | 290 ++++++++++++++++++++++------------------------
 package.json      |   2 +-
 2 files changed, 140 insertions(+), 152 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index d742dc0..af8f76f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -73,6 +73,14 @@
         }
       }
     },
+    "@iktakahiro/markdown-it-katex": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@iktakahiro/markdown-it-katex/-/markdown-it-katex-4.0.1.tgz",
+      "integrity": "sha512-kGFooO7fIOgY34PSG8ZNVsUlKhhNoqhzW2kq94TNGa8COzh73PO4KsEoPOsQVG1mEAe8tg7GqG0FoVao0aMHaw==",
+      "requires": {
+        "katex": "^0.12.0"
+      }
+    },
     "@types/minimatch": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
@@ -181,9 +189,9 @@
       }
     },
     "cliui": {
-      "version": "7.0.2",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.2.tgz",
-      "integrity": "sha512-lhpKkuUj67j5JgZIPZxLe7nSa4MQoojzRVWQyzMqBp2hBg6gwRjUDAwC1YDeBaC3APDBKNnjWbv2mlDF4XgOSA==",
+      "version": "7.0.4",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
+      "integrity": "sha512-OcRE68cOsVMXp1Yvonl/fzkQOyjLSu/8bhPDfQt0e0/Eb283TKP20Fs2MqoPsr9SwA595rRCA+QMzYc9nBP+JQ==",
       "requires": {
         "string-width": "^4.2.0",
         "strip-ansi": "^6.0.0",
@@ -267,9 +275,9 @@
       "integrity": "sha512-eyTcpKOcamdhWJXj56DpQMo1ylSQpcGtGKXcU0Tb97+K56/CF5amAqqqNj0+KvA0iw2ynxtHWFsPDSClCxe48w=="
     },
     "debug": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.2.0.tgz",
-      "integrity": "sha512-IX2ncY78vDTjZMFUdmsvIRFY2Cf4FnD0wRs+nQwJU8Lu99/tPFdb0VybiiMTPe3I6rQmwsqQqRBvxU+bZ/I8sg==",
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
+      "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
       "requires": {
         "ms": "2.1.2"
       },
@@ -281,6 +289,11 @@
         }
       }
     },
+    "deepmerge": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/deepmerge/-/deepmerge-4.2.2.tgz",
+      "integrity": "sha512-FJ3UgI4gIl+PHZm53knsuSFpE+nESMr7M4v9QcgB7S63Kj/6WqMiFQJpBBYz1Pt+66bZpP3Q7Lye0Oo9MPKEdg=="
+    },
     "depd": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
@@ -292,46 +305,56 @@
       "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
     },
     "dom-serializer": {
-      "version": "0.2.2",
-      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.2.2.tgz",
-      "integrity": "sha512-2/xPb3ORsQ42nHYiSunXkDjPLBaEj/xTwUO4B7XCZQTRk7EBtTOPaygh10YAAh2OI1Qrp6NWfpAhzswj0ydt9g==",
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.2.0.tgz",
+      "integrity": "sha512-n6kZFH/KlCrqs/1GHMOd5i2fd/beQHuehKdWvNNffbGHTr/almdhuVvTVFb3V7fglz+nC50fFusu3lY33h12pA==",
       "requires": {
         "domelementtype": "^2.0.1",
+        "domhandler": "^4.0.0",
         "entities": "^2.0.0"
       },
       "dependencies": {
-        "domelementtype": {
-          "version": "2.0.2",
-          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.0.2.tgz",
-          "integrity": "sha512-wFwTwCVebUrMgGeAwRL/NhZtHAUyT9n9yg4IMDwf10+6iCMxSkVq9MGCVEH+QZWo1nNidy8kNvwmv4zWHDTqvA=="
-        },
-        "entities": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/entities/-/entities-2.0.3.tgz",
-          "integrity": "sha512-MyoZ0jgnLvB2X3Lg5HqpFmn1kybDiIfEQmKzTb5apr51Rb+T3KdmMiqa70T+bhGnyv7bQ6WMj2QMHpGMmlrUYQ=="
+        "domhandler": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-4.0.0.tgz",
+          "integrity": "sha512-KPTbnGQ1JeEMQyO1iYXoagsI6so/C96HZiFyByU3T6iAzpXn8EGEvct6unm1ZGoed8ByO2oirxgwxBmqKF9haA==",
+          "requires": {
+            "domelementtype": "^2.1.0"
+          }
         }
       }
     },
     "domelementtype": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.3.1.tgz",
-      "integrity": "sha512-BSKB+TSpMpFI/HOxCNr1O8aMOTZ8hT3pM3GQ0w/mWRmkhEDSFJkkyzz4XQsBV44BChwGkrDfMyjVD0eA2aFV3w=="
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.1.0.tgz",
+      "integrity": "sha512-LsTgx/L5VpD+Q8lmsXSHW2WpA+eBlZ9HPf3erD1IoPF00/3JKHZ3BknUVA2QGDNu69ZNmyFmCWBSO45XjYKC5w=="
     },
     "domhandler": {
-      "version": "2.4.2",
-      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-2.4.2.tgz",
-      "integrity": "sha512-JiK04h0Ht5u/80fdLMCEmV4zkNh2BcoMFBmZ/91WtYZ8qVXSKjiw7fXMgFPnHcSZgOo3XdinHvmnDUeMf5R4wA==",
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-3.3.0.tgz",
+      "integrity": "sha512-J1C5rIANUbuYK+FuFL98650rihynUOEzRLxW+90bKZRWB6A1X1Tf82GxR1qAWLyfNPRvjqfip3Q5tdYlmAa9lA==",
       "requires": {
-        "domelementtype": "1"
+        "domelementtype": "^2.0.1"
       }
     },
     "domutils": {
-      "version": "1.7.0",
-      "resolved": "https://registry.npmjs.org/domutils/-/domutils-1.7.0.tgz",
-      "integrity": "sha512-Lgd2XcJ/NjEw+7tFvfKxOzCYKZsdct5lczQ2ZaQY8Djz7pfAD3Gbp8ySJWtreII/vDlMVmxwa6pHmdxIYgttDg==",
+      "version": "2.4.4",
+      "resolved": "https://registry.npmjs.org/domutils/-/domutils-2.4.4.tgz",
+      "integrity": "sha512-jBC0vOsECI4OMdD0GC9mGn7NXPLb+Qt6KW1YDQzeQYRUFKmNG8lh7mO5HiELfr+lLQE7loDVI4QcAxV80HS+RA==",
       "requires": {
-        "dom-serializer": "0",
-        "domelementtype": "1"
+        "dom-serializer": "^1.0.1",
+        "domelementtype": "^2.0.1",
+        "domhandler": "^4.0.0"
+      },
+      "dependencies": {
+        "domhandler": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-4.0.0.tgz",
+          "integrity": "sha512-KPTbnGQ1JeEMQyO1iYXoagsI6so/C96HZiFyByU3T6iAzpXn8EGEvct6unm1ZGoed8ByO2oirxgwxBmqKF9haA==",
+          "requires": {
+            "domelementtype": "^2.1.0"
+          }
+        }
       }
     },
     "ee-first": {
@@ -360,9 +383,9 @@
       "integrity": "sha512-VWU0/zXzVbeJNXvME/5EmLuEj2TauvoaTz6aFYK1Z92JCBlDlZ3Gu0tuGR42kpW1754ywTs+QB0g5TP0oj9Zaw=="
     },
     "entities": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/entities/-/entities-1.1.2.tgz",
-      "integrity": "sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w=="
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-2.1.0.tgz",
+      "integrity": "sha512-hCx1oky9PFrJ611mf0ifBLBRW8lUUVRlFolb5gWRfIELabBlbp9xZvrqZLZAs+NxFnbfQoeGd8wDkygjg7U85w=="
     },
     "error-ex": {
       "version": "1.3.2",
@@ -565,9 +588,9 @@
       "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw=="
     },
     "highlight.js": {
-      "version": "10.2.1",
-      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-10.2.1.tgz",
-      "integrity": "sha512-A+sckVPIb9zQTUydC9lpRX1qRFO/N0OKEh0NwIr65ckvWA/oMY8v9P3+kGRK3w2ULSh9E8v5MszXafodQ6039g=="
+      "version": "10.4.1",
+      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-10.4.1.tgz",
+      "integrity": "sha512-yR5lWvNz7c85OhVAEAeFhVCc/GV4C30Fjzc/rCP0aCWzc1UUOPUk55dK/qdwTZHBvMZo+eZ2jpk62ndX/xMFlg=="
     },
     "html-minifier": {
       "version": "4.0.0",
@@ -584,27 +607,26 @@
       }
     },
     "html-to-text": {
-      "version": "5.1.1",
-      "resolved": "https://registry.npmjs.org/html-to-text/-/html-to-text-5.1.1.tgz",
-      "integrity": "sha512-Bci6bD/JIfZSvG4s0gW/9mMKwBRoe/1RWLxUME/d6WUSZCdY7T60bssf/jFf7EYXRyqU4P5xdClVqiYU0/ypdA==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/html-to-text/-/html-to-text-6.0.0.tgz",
+      "integrity": "sha512-r0KNC5aqCAItsjlgtirW6RW25c92Ee3ybQj8z//4Sl4suE3HIPqM4deGpYCUJULLjtVPEP1+Ma+1ZeX1iMsCiA==",
       "requires": {
+        "deepmerge": "^4.2.2",
         "he": "^1.2.0",
-        "htmlparser2": "^3.10.1",
-        "lodash": "^4.17.11",
-        "minimist": "^1.2.0"
+        "htmlparser2": "^4.1.0",
+        "lodash": "^4.17.20",
+        "minimist": "^1.2.5"
       }
     },
     "htmlparser2": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-3.10.1.tgz",
-      "integrity": "sha512-IgieNijUMbkDovyoKObU1DUhm1iwNYE/fuifEoEHfd1oZKZDaONBSkal7Y01shxsM49R4XaMdGez3WnF9UfiCQ==",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-4.1.0.tgz",
+      "integrity": "sha512-4zDq1a1zhE4gQso/c5LP1OtrhYTncXNSpvJYtWJBtXAETPlMfi3IFNjGuQbYLuVY4ZR0QMqRVvo4Pdy9KLyP8Q==",
       "requires": {
-        "domelementtype": "^1.3.1",
-        "domhandler": "^2.3.0",
-        "domutils": "^1.5.1",
-        "entities": "^1.1.1",
-        "inherits": "^2.0.1",
-        "readable-stream": "^3.1.1"
+        "domelementtype": "^2.0.1",
+        "domhandler": "^3.0.0",
+        "domutils": "^2.0.0",
+        "entities": "^2.0.0"
       }
     },
     "http-errors": {
@@ -689,9 +711,9 @@
       "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ=="
     },
     "js-yaml": {
-      "version": "3.14.0",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.0.tgz",
-      "integrity": "sha512-/4IbIeHcD9VMHFqDR/gQ7EdZdLimOvW2DdcxFjdyyZ9NsbS+ccrXqVWDtab/lRl5AlUqmpBx8EhPaWR+OtY17A==",
+      "version": "3.14.1",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.1.tgz",
+      "integrity": "sha512-okMH7OXXJ7YrN9Ok3/SXrnu4iX9yOk+25nqX4imS2npuvTYDmo/QEZoqwZkYaIDk3jVvBOTOIEgEhaLOynBS9g==",
       "requires": {
         "argparse": "^1.0.7",
         "esprima": "^4.0.0"
@@ -711,11 +733,11 @@
       }
     },
     "katex": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/katex/-/katex-0.6.0.tgz",
-      "integrity": "sha1-EkGOCRIcBckgQbazuftrqyE8tvM=",
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/katex/-/katex-0.12.0.tgz",
+      "integrity": "sha512-y+8btoc/CK70XqcHqjxiGWBOeIL8upbS0peTPXTvgrh21n1RiWWcIpSWM+4uXq+IAgNh9YYQWdc7LVDPDAEEAg==",
       "requires": {
-        "match-at": "^0.1.0"
+        "commander": "^2.19.0"
       }
     },
     "lines-and-columns": {
@@ -765,27 +787,27 @@
       }
     },
     "loppo": {
-      "version": "0.6.20",
-      "resolved": "https://registry.npmjs.org/loppo/-/loppo-0.6.20.tgz",
-      "integrity": "sha512-+b8XgeBKV6BxVBA8E3rX/MTtamLwor0sqlkLeWSkgPhpheT79goM1TRpRwvaxoE3b65hBlIqH2J9Pff6HkFkjw==",
+      "version": "0.6.23",
+      "resolved": "https://registry.npmjs.org/loppo/-/loppo-0.6.23.tgz",
+      "integrity": "sha512-PVlL8OH3Vwu8Rjm+S6DAPtFCgFW8SwfSlr+MAkTCL6iBrilQpcnFOp1t5pkwxPF6cLE5Z1Fm9IyzG2G/MeS0rQ==",
       "requires": {
         "connect": "^3.7.0",
-        "debug": "4.x",
+        "debug": "^4.3.1",
         "fs-extra": "^9.0.1",
         "html-minifier": "4.x",
-        "html-to-text": "5.x",
-        "js-yaml": "^3.14.0",
+        "html-to-text": "6.x",
+        "js-yaml": "^3.14.1",
         "lodash": "^4.17.20",
         "log-symbols": "4.x",
         "log4js": "^6.3.0",
         "loppo-theme-oceandeep": "2.x",
-        "promptly": "^3.0.3",
+        "promptly": "^3.2.0",
         "serve-static": "^1.14.1",
         "tarim": "^0.1.2",
-        "turpan": "^0.3.0",
+        "turpan": "^0.3.1",
         "walk-sync": "^2.2.0",
         "wordcount": "^1.1.1",
-        "yargs": "16.x"
+        "yargs": "^16.2.0"
       },
       "dependencies": {
         "fs-extra": {
@@ -800,12 +822,19 @@
           }
         },
         "jsonfile": {
-          "version": "6.0.1",
-          "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-6.0.1.tgz",
-          "integrity": "sha512-jR2b5v7d2vIOust+w3wtFKZIfpC2pnRmFAhAC/BuweZFQR8qZzxH1OyrQ10HmdVYiXWkYUqPVsz91cG7EL2FBg==",
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-6.1.0.tgz",
+          "integrity": "sha512-5dgndWOriYSm5cnYaJNhalLNDKOqFwyDB/rr1E9ZsGciGvKPs8R2xYGCacuf3z6K1YKDz182fd+fY3cn3pMqXQ==",
           "requires": {
             "graceful-fs": "^4.1.6",
-            "universalify": "^1.0.0"
+            "universalify": "^2.0.0"
+          },
+          "dependencies": {
+            "universalify": {
+              "version": "2.0.0",
+              "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.0.tgz",
+              "integrity": "sha512-hAZsKq7Yy11Zu1DE0OzWjw7nnLZmJZYTDZZyEFHZdUhV8FkH5MCfoU1XMaxXovpyW5nq5scPqq0ZDP9Zyl04oQ=="
+            }
           }
         },
         "universalify": {
@@ -839,21 +868,21 @@
       }
     },
     "markdown-it": {
-      "version": "11.0.1",
-      "resolved": "https://registry.npmjs.org/markdown-it/-/markdown-it-11.0.1.tgz",
-      "integrity": "sha512-aU1TzmBKcWNNYvH9pjq6u92BML+Hz3h5S/QpfTFwiQF852pLT+9qHsrhM9JYipkOXZxGn+sGH8oyJE9FD9WezQ==",
+      "version": "12.0.3",
+      "resolved": "https://registry.npmjs.org/markdown-it/-/markdown-it-12.0.3.tgz",
+      "integrity": "sha512-M57RsMv+QQmJHz1yCu0gTJRMx/LlxRPtrrw+2kb/CpDVK/graCmWO0qfNnz/SE1FCNdyq3pkMMZ+itTnyT/YGA==",
       "requires": {
-        "argparse": "^1.0.7",
-        "entities": "~2.0.0",
+        "argparse": "^2.0.1",
+        "entities": "~2.1.0",
         "linkify-it": "^3.0.1",
         "mdurl": "^1.0.1",
         "uc.micro": "^1.0.5"
       },
       "dependencies": {
-        "entities": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/entities/-/entities-2.0.3.tgz",
-          "integrity": "sha512-MyoZ0jgnLvB2X3Lg5HqpFmn1kybDiIfEQmKzTb5apr51Rb+T3KdmMiqa70T+bhGnyv7bQ6WMj2QMHpGMmlrUYQ=="
+        "argparse": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
+          "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q=="
         }
       }
     },
@@ -873,9 +902,9 @@
       "integrity": "sha512-3OuqoRUlSxJiuQYu0cWTLHNhhq2xtoSFqsZK8plANg91+RJQU1ziQ6lA2LzmFAEes18uPBsHZpcX6We5l76Nzg=="
     },
     "markdown-it-emoji": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/markdown-it-emoji/-/markdown-it-emoji-1.4.0.tgz",
-      "integrity": "sha1-m+4OmpkKljupbfaYDE/dsF37Tcw="
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/markdown-it-emoji/-/markdown-it-emoji-2.0.0.tgz",
+      "integrity": "sha512-39j7/9vP/CPCKbEI44oV8yoPJTpvfeReTn/COgRhSpNrjWF3PfP/JUxxB0hxV6ynOY8KH8Y8aX9NMDdo6z+6YQ=="
     },
     "markdown-it-footnote": {
       "version": "3.0.2",
@@ -897,14 +926,6 @@
       "resolved": "https://registry.npmjs.org/markdown-it-ins/-/markdown-it-ins-3.0.0.tgz",
       "integrity": "sha512-+vyAdBuMGwmT2yMlAFJSx2VR/0QZ1onQ/Mkkmr4l9tDFOh5sVoAgRbkgbuSsk+sxJ9vaMH/IQ323ydfvQrPO/Q=="
     },
-    "markdown-it-katex": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/markdown-it-katex/-/markdown-it-katex-2.0.3.tgz",
-      "integrity": "sha1-17hqGuoLnWSW+rTnkZoY/e9YnDk=",
-      "requires": {
-        "katex": "^0.6.0"
-      }
-    },
     "markdown-it-mark": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/markdown-it-mark/-/markdown-it-mark-3.0.0.tgz",
@@ -925,11 +946,6 @@
       "resolved": "https://registry.npmjs.org/markdown-it-task-lists/-/markdown-it-task-lists-2.1.1.tgz",
       "integrity": "sha512-TxFAc76Jnhb2OUu+n3yz9RMu4CwGfaT788br6HhEDlvWfdeJcLUsxk1Hgw2yJio0OXsxv7pyIPmvECY7bMbluA=="
     },
-    "match-at": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/match-at/-/match-at-0.1.1.tgz",
-      "integrity": "sha512-h4Yd392z9mST+dzc+yjuybOGFNOZjmXIPKWjxBd1Bb23r4SmDOsk2NYCU2BMUBGbSpZqwVsZYNq26QS3xfaT3Q=="
-    },
     "match-words": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/match-words/-/match-words-0.1.1.tgz",
@@ -1133,9 +1149,9 @@
       "integrity": "sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw="
     },
     "promptly": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/promptly/-/promptly-3.1.0.tgz",
-      "integrity": "sha512-ygvIcmkt+eWtrQwI1/w7wDfzfAWI7IJX1AUVsWQEQwTmpQ5jeSyiD1g6NuI9VXWhz8LK5a5Bcngp/sKnOgQtiA==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/promptly/-/promptly-3.2.0.tgz",
+      "integrity": "sha512-WnR9obtgW+rG4oUV3hSnNGl1pHm3V1H/qD9iJBumGSmVsSC5HpZOLuu8qdMb6yCItGfT7dcRszejr/5P3i9Pug==",
       "requires": {
         "read": "^1.0.4"
       }
@@ -1162,16 +1178,6 @@
         "mute-stream": "~0.0.4"
       }
     },
-    "readable-stream": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
-      "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
-      "requires": {
-        "inherits": "^2.0.3",
-        "string_decoder": "^1.1.1",
-        "util-deprecate": "^1.0.1"
-      }
-    },
     "relateurl": {
       "version": "0.2.7",
       "resolved": "https://registry.npmjs.org/relateurl/-/relateurl-0.2.7.tgz",
@@ -1192,11 +1198,6 @@
       "resolved": "https://registry.npmjs.org/rfdc/-/rfdc-1.1.4.tgz",
       "integrity": "sha512-5C9HXdzK8EAqN7JDif30jqsBzavB7wLpaubisuQIGHWf2gUXSpzy6ArX/+Da8RjFpagWsCn+pIgxTMAmKw9Zug=="
     },
-    "safe-buffer": {
-      "version": "5.2.1",
-      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
-    },
     "semver": {
       "version": "6.3.0",
       "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
@@ -1337,14 +1338,6 @@
         }
       }
     },
-    "string_decoder": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
-      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
-      "requires": {
-        "safe-buffer": "~5.2.0"
-      }
-    },
     "strip-ansi": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
@@ -1397,28 +1390,28 @@
       }
     },
     "turpan": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/turpan/-/turpan-0.3.0.tgz",
-      "integrity": "sha512-pFI2Uo4AkalVy+xNuFO8AUW2Ys0ngeQfhBkLrNswBjsX1XLC5r4lgVY2cjeZSDuh9gIZCNYwjKMqvbSPJqT3lw==",
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/turpan/-/turpan-0.3.1.tgz",
+      "integrity": "sha512-jL6AMHTA2yExzbSoZTRinbWPzf9nvQfVFk0V6JlBTIbPCKMbAfgXRFHZuOFe6ZXm6+LE6s3jypNRNXkAY2yKaw==",
       "requires": {
+        "@iktakahiro/markdown-it-katex": "^4.0.1",
         "clone": "^2.1.1",
         "github-slugger": "^1.1.1",
-        "highlight.js": "^10.2.0",
-        "markdown-it": "^11.0.1",
+        "highlight.js": "^10.4.1",
+        "markdown-it": "^12.0.1",
         "markdown-it-abbr": "^1.0.4",
         "markdown-it-container": "^3.0.0",
         "markdown-it-deflist": "^2.0.1",
-        "markdown-it-emoji": "^1.3.0",
+        "markdown-it-emoji": "^2.0.0",
         "markdown-it-footnote": "^3.0.1",
         "markdown-it-implicit-figures": "^0.10.0",
         "markdown-it-imsize": "^2.0.1",
         "markdown-it-ins": "^3.0.0",
-        "markdown-it-katex": "^2.0.3",
         "markdown-it-mark": "^3.0.0",
         "markdown-it-sub": "^1.0.0",
         "markdown-it-sup": "^1.0.0",
         "markdown-it-task-lists": "^2.1.1",
-        "yargs": "^16.0.3"
+        "yargs": "^16.1.1"
       }
     },
     "uc.micro": {
@@ -1427,9 +1420,9 @@
       "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA=="
     },
     "uglify-js": {
-      "version": "3.11.2",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.11.2.tgz",
-      "integrity": "sha512-G440NU6fewtnQftSgqRV1r2A5ChKbU1gqFCJ7I8S7MPpY/eZZfLGefaY6gUZYiWebMaO+txgiQ1ZyLDuNWJulg=="
+      "version": "3.12.2",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.12.2.tgz",
+      "integrity": "sha512-rWYleAvfJPjduYCt+ELvzybNah/zIkRteGXIBO8X0lteRZPGladF61hFi8tU7qKTsF7u6DUQCtT9k00VlFOgkg=="
     },
     "universalify": {
       "version": "0.1.2",
@@ -1446,11 +1439,6 @@
       "resolved": "https://registry.npmjs.org/upper-case/-/upper-case-1.1.3.tgz",
       "integrity": "sha1-9rRQHC7EzdJrp4vnIilh3ndiFZg="
     },
-    "util-deprecate": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
-    },
     "utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -1501,9 +1489,9 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "y18n": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.2.tgz",
-      "integrity": "sha512-CkwaeZw6dQgqgPGeTWKMXCRmMcBgETFlTml1+ZOO+q7kGst8NREJ+eWwFNPVUQ4QGdAaklbqCZHH6Zuep1RjiA=="
+      "version": "5.0.5",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.5.tgz",
+      "integrity": "sha512-hsRUr4FFrvhhRH12wOdfs38Gy7k2FFzB9qgN9v3aLykRq0dRcdcpz5C9FxdS2NuhOrI/628b/KSTJ3rwHysYSg=="
     },
     "yaml": {
       "version": "1.10.0",
@@ -1511,23 +1499,23 @@
       "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg=="
     },
     "yargs": {
-      "version": "16.0.3",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.0.3.tgz",
-      "integrity": "sha512-6+nLw8xa9uK1BOEOykaiYAJVh6/CjxWXK/q9b5FpRgNslt8s22F2xMBqVIKgCRjNgGvGPBy8Vog7WN7yh4amtA==",
+      "version": "16.2.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
+      "integrity": "sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==",
       "requires": {
-        "cliui": "^7.0.0",
-        "escalade": "^3.0.2",
+        "cliui": "^7.0.2",
+        "escalade": "^3.1.1",
         "get-caller-file": "^2.0.5",
         "require-directory": "^2.1.1",
         "string-width": "^4.2.0",
-        "y18n": "^5.0.1",
-        "yargs-parser": "^20.0.0"
+        "y18n": "^5.0.5",
+        "yargs-parser": "^20.2.2"
       }
     },
     "yargs-parser": {
-      "version": "20.2.2",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.2.tgz",
-      "integrity": "sha512-XmrpXaTl6noDsf1dKpBuUNCOHqjs0g3jRMXf/ztRxdOmb+er8kE5z5b55Lz3p5u2T8KJ59ENBnASS8/iapVJ5g=="
+      "version": "20.2.4",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
+      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA=="
     }
   }
 }
diff --git a/package.json b/package.json
index 9afffe5..f88f0b9 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
   "dependencies": {
     "gh-pages": "^3.1.0",
     "husky": "^4.3.6",
-    "loppo": "^0.6.20",
+    "loppo": "^0.6.23",
     "loppo-theme-wangdoc": "^0.4.6"
   }
 }

From 0d4bbdca4cc7b30c159be721792cdc496a5ff87e Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 20 Dec 2020 18:24:23 +0800
Subject: [PATCH 044/123] docs(bom): edit URL

---
 docs/bom/form.md     |  8 ++++----
 docs/bom/location.md | 12 +++++++-----
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/docs/bom/form.md b/docs/bom/form.md
index c4bb42b..7b71500 100644
--- a/docs/bom/form.md
+++ b/docs/bom/form.md
@@ -80,15 +80,15 @@ formElement.reset()
 
 ### 概述
 
-表单数据以键值对的形式向服务器发送，这个过程是浏览器自动完成的。但是有时候，我们希望通过脚本完成过程，构造和编辑表单键值对，然后通过`XMLHttpRequest.send()`方法发送。浏览器原生提供了 FormData 对象来完成这项工作。
+表单数据以键值对的形式向服务器发送，这个过程是浏览器自动完成的。但是有时候，我们希望通过脚本完成这个过程，构造或编辑表单的键值对，然后通过脚本发送给服务器。浏览器原生提供了 FormData 对象来完成这项工作。
 
-FormData 首先是一个构造函数，用来生成实例。
+`FormData()`首先是一个构造函数，用来生成表单的实例。
 
 ```javascript
 var formdata = new FormData(form);
 ```
 
-`FormData()`构造函数的参数是一个表单元素，这个参数是可选的。如果省略参数，就表示一个空的表单，否则就会处理表单元素里面的键值对。
+`FormData()`构造函数的参数是一个 DOM 的表单元素，构造函数会自动处理表单的键值对。这个参数是可选的，如果省略该参数，就表示一个空的表单。
 
 下面是一个表单。
 
@@ -110,7 +110,7 @@ var formdata = new FormData(form);
 </form>
 ```
 
-我们用 FormData 对象处理上面这个表单。
+我们用`FormData()`处理上面这个表单。
 
 ```javascript
 var myForm = document.getElementById('myForm');
diff --git a/docs/bom/location.md b/docs/bom/location.md
index 4ea667e..8d75a8f 100644
--- a/docs/bom/location.md
+++ b/docs/bom/location.md
@@ -173,11 +173,11 @@ decodeURIComponent('%E6%98%A5%E8%8A%82')
 
 ## URL 接口
 
-`URL`接口是一个构造函数，浏览器原生提供，可以用来构造、解析和编码 URL。一般情况下，通过`window.URL`可以拿到这个构造函数。
+浏览器原生提供`URL()`接口，它是一个构造函数，用来构造、解析和编码 URL。一般情况下，通过`window.URL`可以拿到这个构造函数。
 
 ### 构造函数
 
-`URL`作为构造函数，可以生成 URL 实例。它接受一个表示 URL 的字符串作为参数。如果参数不是合法的 URL，会报错。
+`URL()`作为构造函数，可以生成 URL 实例。它接受一个表示 URL 的字符串作为参数。如果参数不是合法的 URL，会报错。
 
 ```javascript
 var url = new URL('http://www.example.com/index.html');
@@ -185,7 +185,9 @@ url.href
 // "http://www.example.com/index.html"
 ```
 
-如果参数是另一个 URL 实例，构造函数会自动读取该实例的`href`属性，作为实际参数。
+上面示例生成了一个 URL 实例，用来代表指定的网址。
+
+除了字符串，`URL()`的参数也可以是另一个 URL 实例。这时，`URL()`会自动读取该实例的`href`属性，作为实际参数。
 
 如果 URL 字符串是一个相对路径，那么需要表示绝对路径的第二个参数，作为计算基准。
 
@@ -251,7 +253,7 @@ url.username
 // "user"
 ```
 
-这些属性里面，只有`origin`属性是只读的，其他属性都可写。
+这些属性里面，只有`origin`属性是只读的，其他属性都可写，并且会立即生效。
 
 ```javascript
 var url = new URL('http://example.com/index.html#part1');
@@ -367,7 +369,7 @@ fetch('https://example.com/api', {
 
 上面代码中，`fetch`命令向服务器发送命令时，可以直接使用`URLSearchParams`实例。
 
-`URLSearchParams`可以与`URL`接口结合使用。
+`URLSearchParams`可以与`URL()`接口结合使用。
 
 ```javascript
 var url = new URL(window.location);

From 881f0b246549fa3cb9e177a4fc95c40edff50a8f Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 24 Dec 2020 21:42:34 +0800
Subject: [PATCH 045/123] refactor: update dependencies

---
 package-lock.json | 6 +++---
 package.json      | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index af8f76f..68bd04d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -850,9 +850,9 @@
       "integrity": "sha1-Mswjj72pUEpmZVTkbZdlh8LA9Ww="
     },
     "loppo-theme-wangdoc": {
-      "version": "0.4.6",
-      "resolved": "https://registry.npmjs.org/loppo-theme-wangdoc/-/loppo-theme-wangdoc-0.4.6.tgz",
-      "integrity": "sha512-6rIopeDYe83kCDMatFkDzc/fZKtwUJ6+raV+maSmP05BFKkdtp3+k2yJjLsNj4QhkPB/RO0vfTwgcE30FBBwHw=="
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/loppo-theme-wangdoc/-/loppo-theme-wangdoc-0.5.1.tgz",
+      "integrity": "sha512-tgGNCZeoKCcKDvwDmuoaOW3FJ0Q3Zvjj4JwLqxtU+rAeFz0YIIc0ZCgm5jXcaFxa+V79RzTu/JZKJq+os4no4A=="
     },
     "lower-case": {
       "version": "1.1.4",
diff --git a/package.json b/package.json
index f88f0b9..c09b2e8 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,6 @@
     "gh-pages": "^3.1.0",
     "husky": "^4.3.6",
     "loppo": "^0.6.23",
-    "loppo-theme-wangdoc": "^0.4.6"
+    "loppo-theme-wangdoc": "^0.5.1"
   }
 }

From 51a586c6ab87f567940e338b731f1b0b85d35efe Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 14 Jan 2021 11:06:11 +0800
Subject: [PATCH 046/123] docs(XMLHttpRequest: fix #211

---
 docs/bom/xmlhttprequest.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/xmlhttprequest.md b/docs/bom/xmlhttprequest.md
index be0ee13..8855064 100644
--- a/docs/bom/xmlhttprequest.md
+++ b/docs/bom/xmlhttprequest.md
@@ -143,7 +143,7 @@ xhr.onreadystatechange = function () {
 
 ### XMLHttpRequest.responseType
 
-`XMLHttpRequest.responseType`属性是一个字符串，表示服务器返回数据的类型。这个属性是可写的，可以在调用`open()`方法之后、调用`send()`方法之前，设置这个属性的值，告诉服务器返回指定类型的数据。如果`responseType`设为空字符串，就等同于默认值`text`。
+`XMLHttpRequest.responseType`属性是一个字符串，表示服务器返回数据的类型。这个属性是可写的，可以在调用`open()`方法之后、调用`send()`方法之前，设置这个属性的值，告诉浏览器如何解读返回的数据。如果`responseType`设为空字符串，就等同于默认值`text`。
 
 `XMLHttpRequest.responseType`属性可以等于以下值。
 

From a9c543be2b9e925a5909de052d5d260bc65100fc Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Fri, 22 Jan 2021 22:57:03 +0800
Subject: [PATCH 047/123] docs(bom): fix location

---
 docs/bom/location.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/location.md b/docs/bom/location.md
index 8d75a8f..7233095 100644
--- a/docs/bom/location.md
+++ b/docs/bom/location.md
@@ -481,7 +481,7 @@ params.toString() // "foo=3"
 ```javascript
 // URL: https://example.com?version=1.0
 var params = new URLSearchParams(location.search.slice(1));
-params.set('version', 2.0);
+params.set('version', '2.0');
 
 window.history.replaceState({}, '', location.pathname + `?` + params);
 // URL: https://example.com?version=2.0

From 692eb7162d1969eecc933722c1836ea5d09626cb Mon Sep 17 00:00:00 2001
From: wqliang <2462792@qq.com>
Date: Thu, 4 Feb 2021 11:43:10 +0800
Subject: [PATCH 048/123] =?UTF-8?q?#212=20FIX=209.3=20Object.definePropert?=
 =?UTF-8?q?y,=E5=AF=B9=E8=B1=A1=E5=90=8Do=E5=BA=94=E8=AF=A5=E6=98=AFobj?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/stdlib/attributes.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/stdlib/attributes.md b/docs/stdlib/attributes.md
index 1440a67..f1f3af6 100644
--- a/docs/stdlib/attributes.md
+++ b/docs/stdlib/attributes.md
@@ -635,7 +635,7 @@ Object.getOwnPropertyDescriptor(obj, 'p')
 //   configurable: false
 // }
 
-Object.defineProperty(o, 'p', {
+Object.defineProperty(obj, 'p', {
   enumerable: false
 })
 // TypeError: Cannot redefine property: p

From df064ca9e33627481435bad105909bcc48791e9d Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 11 Feb 2021 15:47:21 +0800
Subject: [PATCH 049/123] docs(stdlib/array): fix typo

---
 docs/stdlib/array.md |   8 ++--
 package-lock.json    | 108 +++++++++++++++++++++++++++++++------------
 2 files changed, 82 insertions(+), 34 deletions(-)

diff --git a/docs/stdlib/array.md b/docs/stdlib/array.md
index f2d971f..caacce2 100644
--- a/docs/stdlib/array.md
+++ b/docs/stdlib/array.md
@@ -15,14 +15,14 @@ arr // [ empty x 2 ]
 如果没有使用`new`关键字，运行结果也是一样的。
 
 ```javascript
-var arr = new Array(2);
-// 等同于
 var arr = Array(2);
+// 等同于
+var arr = new Array(2);
 ```
 
-考虑到语义性，以及与其他构造函数用户保持一致，建议总是加上`new`。
+考虑到语义性，以及与其他构造函数用法保持一致，建议总是加上`new`。
 
-`Array()`构造函数有一个很大的缺陷，不同的参数会导致行为不一致。
+`Array()`构造函数有一个很大的缺陷，不同的参数个数会导致不一致的行为。
 
 ```javascript
 // 无参数时，返回一个空数组
diff --git a/package-lock.json b/package-lock.json
index 68bd04d..12d5408 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -488,11 +488,11 @@
       }
     },
     "find-versions": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/find-versions/-/find-versions-3.2.0.tgz",
-      "integrity": "sha512-P8WRou2S+oe222TOCHitLy8zj+SIsVJh52VP4lvXkaFVnOFFdoWv1H1Jjvel1aI6NCFOAaeAVm8qrI0odiLcww==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/find-versions/-/find-versions-4.0.0.tgz",
+      "integrity": "sha512-wgpWy002tA+wgmO27buH/9KzyEOQnKsG/R0yrcjPT9BOFm0zRBVQbZ95nRGXWMywS8YR5knRbpohio0bcJABxQ==",
       "requires": {
-        "semver-regex": "^2.0.0"
+        "semver-regex": "^3.1.2"
       }
     },
     "flatted": {
@@ -588,9 +588,9 @@
       "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw=="
     },
     "highlight.js": {
-      "version": "10.4.1",
-      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-10.4.1.tgz",
-      "integrity": "sha512-yR5lWvNz7c85OhVAEAeFhVCc/GV4C30Fjzc/rCP0aCWzc1UUOPUk55dK/qdwTZHBvMZo+eZ2jpk62ndX/xMFlg=="
+      "version": "10.5.0",
+      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-10.5.0.tgz",
+      "integrity": "sha512-xTmvd9HiIHR6L53TMC7TKolEj65zG1XU+Onr8oi86mYa+nLcIbxTTWkpW7CsEwv/vK7u1zb8alZIMLDqqN6KTw=="
     },
     "html-minifier": {
       "version": "4.0.0",
@@ -651,26 +651,69 @@
       }
     },
     "husky": {
-      "version": "4.3.6",
-      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.6.tgz",
-      "integrity": "sha512-o6UjVI8xtlWRL5395iWq9LKDyp/9TE7XMOTvIpEVzW638UcGxTmV5cfel6fsk/jbZSTlvfGVJf2svFtybcIZag==",
+      "version": "4.3.7",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.7.tgz",
+      "integrity": "sha512-0fQlcCDq/xypoyYSJvEuzbDPHFf8ZF9IXKJxlrnvxABTSzK1VPT2RKYQKrcgJ+YD39swgoB6sbzywUqFxUiqjw==",
       "requires": {
         "chalk": "^4.0.0",
         "ci-info": "^2.0.0",
         "compare-versions": "^3.6.0",
         "cosmiconfig": "^7.0.0",
-        "find-versions": "^3.2.0",
+        "find-versions": "^4.0.0",
         "opencollective-postinstall": "^2.0.2",
-        "pkg-dir": "^4.2.0",
+        "pkg-dir": "^5.0.0",
         "please-upgrade-node": "^3.2.0",
         "slash": "^3.0.0",
         "which-pm-runs": "^1.0.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-5.0.0.tgz",
+          "integrity": "sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==",
+          "requires": {
+            "locate-path": "^6.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
+          "integrity": "sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==",
+          "requires": {
+            "p-locate": "^5.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.1.0.tgz",
+          "integrity": "sha512-TYOanM3wGwNGsZN2cVTYPArw454xnXj5qmWF1bEoAc4+cU/ol7GVh7odevjp1FNHduHc3KZMcFduxU5Xc6uJRQ==",
+          "requires": {
+            "yocto-queue": "^0.1.0"
+          }
+        },
+        "p-locate": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-5.0.0.tgz",
+          "integrity": "sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw==",
+          "requires": {
+            "p-limit": "^3.0.2"
+          }
+        },
+        "pkg-dir": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-5.0.0.tgz",
+          "integrity": "sha512-NPE8TDbzl/3YQYY7CSS228s3g2ollTFnc+Qi3tqmqJp9Vg2ovUpixcJEo2HJScN2Ez+kEaal6y70c0ehqJBJeA==",
+          "requires": {
+            "find-up": "^5.0.0"
+          }
+        }
       }
     },
     "import-fresh": {
-      "version": "3.2.2",
-      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.2.2.tgz",
-      "integrity": "sha512-cTPNrlvJT6twpYy+YmKUKrTSjWFs3bjYjAhCwm+z4EOCubZxAuO+hHpRN64TqjEaYSHs7tJAE0w1CKMGmsG/lw==",
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
+      "integrity": "sha512-veYYhQa+D1QBKznvhUHxb8faxlrwUnxseDAbAp457E0wLNio2bOSKnjYDhMj+YiAq61xrMGhQk9iXVk5FzgQMw==",
       "requires": {
         "parent-module": "^1.0.0",
         "resolve-from": "^4.0.0"
@@ -868,9 +911,9 @@
       }
     },
     "markdown-it": {
-      "version": "12.0.3",
-      "resolved": "https://registry.npmjs.org/markdown-it/-/markdown-it-12.0.3.tgz",
-      "integrity": "sha512-M57RsMv+QQmJHz1yCu0gTJRMx/LlxRPtrrw+2kb/CpDVK/graCmWO0qfNnz/SE1FCNdyq3pkMMZ+itTnyT/YGA==",
+      "version": "12.0.4",
+      "resolved": "https://registry.npmjs.org/markdown-it/-/markdown-it-12.0.4.tgz",
+      "integrity": "sha512-34RwOXZT8kyuOJy25oJNJoulO8L0bTHYWXcdZBYZqFnjIy3NgjeoM3FmPXIOFQ26/lSHYMr8oc62B6adxXcb3Q==",
       "requires": {
         "argparse": "^2.0.1",
         "entities": "~2.1.0",
@@ -922,14 +965,14 @@
       "integrity": "sha1-zKBCeQXQUziiR8ucqdloxc3dUXA="
     },
     "markdown-it-ins": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/markdown-it-ins/-/markdown-it-ins-3.0.0.tgz",
-      "integrity": "sha512-+vyAdBuMGwmT2yMlAFJSx2VR/0QZ1onQ/Mkkmr4l9tDFOh5sVoAgRbkgbuSsk+sxJ9vaMH/IQ323ydfvQrPO/Q=="
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/markdown-it-ins/-/markdown-it-ins-3.0.1.tgz",
+      "integrity": "sha512-32SSfZqSzqyAmmQ4SHvhxbFqSzPDqsZgMHDwxqPzp+v+t8RsmqsBZRG+RfRQskJko9PfKC2/oxyOs4Yg/CfiRw=="
     },
     "markdown-it-mark": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/markdown-it-mark/-/markdown-it-mark-3.0.0.tgz",
-      "integrity": "sha512-HqMWeKfMMOu4zBO0emmxsoMWmbf2cPKZY1wP6FsTbKmicFfp5y4L3KXAsNeO1rM6NTJVOrNlLKMPjWzriBGspw=="
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/markdown-it-mark/-/markdown-it-mark-3.0.1.tgz",
+      "integrity": "sha512-HyxjAu6BRsdt6Xcv6TKVQnkz/E70TdGXEFHRYBGLncRE9lBFwDNLVtFojKxjJWgJ+5XxUwLaHXy+2sGBbDn+4A=="
     },
     "markdown-it-sub": {
       "version": "1.0.0",
@@ -1209,9 +1252,9 @@
       "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w="
     },
     "semver-regex": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/semver-regex/-/semver-regex-2.0.0.tgz",
-      "integrity": "sha512-mUdIBBvdn0PLOeP3TEkMH7HHeUP3GjsXCwKarjv/kGmUFOYg1VqEemKhoQpWMu6X2I8kHeuVdGibLGkVK+/5Qw=="
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/semver-regex/-/semver-regex-3.1.2.tgz",
+      "integrity": "sha512-bXWyL6EAKOJa81XG1OZ/Yyuq+oT0b2YLlxx7c+mrdYPaPbnj6WgVULXhinMIeZGufuUBu/eVRqXEhiv4imfwxA=="
     },
     "send": {
       "version": "0.17.1",
@@ -1420,9 +1463,9 @@
       "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA=="
     },
     "uglify-js": {
-      "version": "3.12.2",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.12.2.tgz",
-      "integrity": "sha512-rWYleAvfJPjduYCt+ELvzybNah/zIkRteGXIBO8X0lteRZPGladF61hFi8tU7qKTsF7u6DUQCtT9k00VlFOgkg=="
+      "version": "3.12.4",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.12.4.tgz",
+      "integrity": "sha512-L5i5jg/SHkEqzN18gQMTWsZk3KelRsfD1wUVNqtq0kzqWQqcJjyL8yc1o8hJgRrWqrAl2mUFbhfznEIoi7zi2A=="
     },
     "universalify": {
       "version": "0.1.2",
@@ -1516,6 +1559,11 @@
       "version": "20.2.4",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
       "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA=="
+    },
+    "yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q=="
     }
   }
 }

From d848f184a3267b39ccfd00c136bbd45349ec1027 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Fri, 12 Feb 2021 17:28:08 +0800
Subject: [PATCH 050/123] refactor: update dependencies

---
 package-lock.json | 84 +++++++++++++++++++++++++++++++++++++----------
 package.json      |  2 +-
 2 files changed, 67 insertions(+), 19 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 68bd04d..458cd9d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -488,11 +488,11 @@
       }
     },
     "find-versions": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/find-versions/-/find-versions-3.2.0.tgz",
-      "integrity": "sha512-P8WRou2S+oe222TOCHitLy8zj+SIsVJh52VP4lvXkaFVnOFFdoWv1H1Jjvel1aI6NCFOAaeAVm8qrI0odiLcww==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/find-versions/-/find-versions-4.0.0.tgz",
+      "integrity": "sha512-wgpWy002tA+wgmO27buH/9KzyEOQnKsG/R0yrcjPT9BOFm0zRBVQbZ95nRGXWMywS8YR5knRbpohio0bcJABxQ==",
       "requires": {
-        "semver-regex": "^2.0.0"
+        "semver-regex": "^3.1.2"
       }
     },
     "flatted": {
@@ -651,26 +651,69 @@
       }
     },
     "husky": {
-      "version": "4.3.6",
-      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.6.tgz",
-      "integrity": "sha512-o6UjVI8xtlWRL5395iWq9LKDyp/9TE7XMOTvIpEVzW638UcGxTmV5cfel6fsk/jbZSTlvfGVJf2svFtybcIZag==",
+      "version": "4.3.8",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.8.tgz",
+      "integrity": "sha512-LCqqsB0PzJQ/AlCgfrfzRe3e3+NvmefAdKQhRYpxS4u6clblBoDdzzvHi8fmxKRzvMxPY/1WZWzomPZww0Anow==",
       "requires": {
         "chalk": "^4.0.0",
         "ci-info": "^2.0.0",
         "compare-versions": "^3.6.0",
         "cosmiconfig": "^7.0.0",
-        "find-versions": "^3.2.0",
+        "find-versions": "^4.0.0",
         "opencollective-postinstall": "^2.0.2",
-        "pkg-dir": "^4.2.0",
+        "pkg-dir": "^5.0.0",
         "please-upgrade-node": "^3.2.0",
         "slash": "^3.0.0",
         "which-pm-runs": "^1.0.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-5.0.0.tgz",
+          "integrity": "sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==",
+          "requires": {
+            "locate-path": "^6.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
+          "integrity": "sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==",
+          "requires": {
+            "p-locate": "^5.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.1.0.tgz",
+          "integrity": "sha512-TYOanM3wGwNGsZN2cVTYPArw454xnXj5qmWF1bEoAc4+cU/ol7GVh7odevjp1FNHduHc3KZMcFduxU5Xc6uJRQ==",
+          "requires": {
+            "yocto-queue": "^0.1.0"
+          }
+        },
+        "p-locate": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-5.0.0.tgz",
+          "integrity": "sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw==",
+          "requires": {
+            "p-limit": "^3.0.2"
+          }
+        },
+        "pkg-dir": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-5.0.0.tgz",
+          "integrity": "sha512-NPE8TDbzl/3YQYY7CSS228s3g2ollTFnc+Qi3tqmqJp9Vg2ovUpixcJEo2HJScN2Ez+kEaal6y70c0ehqJBJeA==",
+          "requires": {
+            "find-up": "^5.0.0"
+          }
+        }
       }
     },
     "import-fresh": {
-      "version": "3.2.2",
-      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.2.2.tgz",
-      "integrity": "sha512-cTPNrlvJT6twpYy+YmKUKrTSjWFs3bjYjAhCwm+z4EOCubZxAuO+hHpRN64TqjEaYSHs7tJAE0w1CKMGmsG/lw==",
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
+      "integrity": "sha512-veYYhQa+D1QBKznvhUHxb8faxlrwUnxseDAbAp457E0wLNio2bOSKnjYDhMj+YiAq61xrMGhQk9iXVk5FzgQMw==",
       "requires": {
         "parent-module": "^1.0.0",
         "resolve-from": "^4.0.0"
@@ -1079,9 +1122,9 @@
       }
     },
     "parse-json": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.1.0.tgz",
-      "integrity": "sha512-+mi/lmVVNKFNVyLXV31ERiy2CY5E1/F6QtJFEzoChPRwwngMNXRDQ9GJ5WdE2Z2P4AujsOi0/+2qHID68KwfIQ==",
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.2.0.tgz",
+      "integrity": "sha512-ayCKvm/phCGxOkYRSCM82iDwct8/EonSEgCSxWxD7ve6jHggsFl4fZVQBPRNgQoKiuV/odhFrGzQXZwbifC8Rg==",
       "requires": {
         "@babel/code-frame": "^7.0.0",
         "error-ex": "^1.3.1",
@@ -1209,9 +1252,9 @@
       "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w="
     },
     "semver-regex": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/semver-regex/-/semver-regex-2.0.0.tgz",
-      "integrity": "sha512-mUdIBBvdn0PLOeP3TEkMH7HHeUP3GjsXCwKarjv/kGmUFOYg1VqEemKhoQpWMu6X2I8kHeuVdGibLGkVK+/5Qw=="
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/semver-regex/-/semver-regex-3.1.2.tgz",
+      "integrity": "sha512-bXWyL6EAKOJa81XG1OZ/Yyuq+oT0b2YLlxx7c+mrdYPaPbnj6WgVULXhinMIeZGufuUBu/eVRqXEhiv4imfwxA=="
     },
     "send": {
       "version": "0.17.1",
@@ -1516,6 +1559,11 @@
       "version": "20.2.4",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
       "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA=="
+    },
+    "yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q=="
     }
   }
 }
diff --git a/package.json b/package.json
index c09b2e8..e610caa 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
     "gh-pages": "^3.1.0",
-    "husky": "^4.3.6",
+    "husky": "^4.3.8",
     "loppo": "^0.6.23",
     "loppo-theme-wangdoc": "^0.5.1"
   }

From 962851dbccf61933bd66f22bff57788a6df14e00 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Fri, 12 Feb 2021 17:37:57 +0800
Subject: [PATCH 051/123] docs(event/drag): fix typo

---
 docs/events/drag.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/events/drag.md b/docs/events/drag.md
index 4310edb..b524c3a 100644
--- a/docs/events/drag.md
+++ b/docs/events/drag.md
@@ -200,7 +200,7 @@ source.addEventListener('dragstart', function (e) {
 });
 
 target.addEventListener('dragover', function (e) {
-  ev.dataTransfer.dropEffect = 'move';
+  e.dataTransfer.dropEffect = 'move';
 });
 ```
 

From 173079e708e576ba4022d9aa3c0355cb24570060 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 14 Feb 2021 20:42:07 +0800
Subject: [PATCH 052/123] docs(basic/history): fixed #214

---
 docs/basic/history.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/basic/history.md b/docs/basic/history.md
index 06a4131..0c03d6d 100644
--- a/docs/basic/history.md
+++ b/docs/basic/history.md
@@ -125,7 +125,7 @@ JavaScript 伴随着互联网的发展一起发展。互联网周边技术的快
 
 2007年，Webkit 引擎在 iPhone 手机中得到部署。它最初基于 KDE 项目，2003年苹果公司首先采用，2005年开源。这标志着 JavaScript 语言开始能在手机中使用了，意味着有可能写出在桌面电脑和手机中都能使用的程序。
 
-2007年，Douglas Crockford 发表了名为《JavaScript: The good parts》的演讲，次年由 O'Reilly 出版社出版。这标志着软件行业开始严肃对待 JavaScript 语言，对它的语法开始重新认识，
+2007年，Douglas Crockford 发表了名为《JavaScript: The good parts》的演讲，次年由 O'Reilly 出版社出版。这标志着软件行业开始严肃对待 JavaScript 语言，对它的语法开始重新认识。
 
 2008年，V8 编译器诞生。这是 Google 公司为 Chrome 浏览器而开发的，它的特点是让 JavaScript 的运行变得非常快。它提高了 JavaScript 的性能，推动了语法的改进和标准化，改变外界对 JavaScript 的不佳印象。同时，V8 是开源的，任何人想要一种快速的嵌入式脚本语言，都可以采用 V8，这拓展了 JavaScript 的应用领域。
 

From d492be03bed0fcaa13565f7fc13091162a1453d8 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 14 Feb 2021 20:46:48 +0800
Subject: [PATCH 053/123] docs(types/general): fixed #215

---
 docs/types/general.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/types/general.md b/docs/types/general.md
index 3c0ea7e..8454b44 100644
--- a/docs/types/general.md
+++ b/docs/types/general.md
@@ -4,10 +4,10 @@
 
 JavaScript 语言的每一个值，都属于某一种数据类型。JavaScript 的数据类型，共有六种。（ES6 又新增了第七种 Symbol 类型的值，本教程不涉及。）
 
-- 数值（number）：整数和小数（比如`1`和`3.14`）
+- 数值（number）：整数和小数（比如`1`和`3.14`）。
 - 字符串（string）：文本（比如`Hello World`）。
-- 布尔值（boolean）：表示真伪的两个特殊值，即`true`（真）和`false`（假）
-- `undefined`：表示“未定义”或不存在，即由于目前没有定义，所以此处暂时没有任何值
+- 布尔值（boolean）：表示真伪的两个特殊值，即`true`（真）和`false`（假）。
+- `undefined`：表示“未定义”或不存在，即由于目前没有定义，所以此处暂时没有任何值。
 - `null`：表示空值，即此处的值为空。
 - 对象（object）：各种值组成的集合。
 

From 39c49f385844d628058ae0c643400f93be0c618b Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 24 Feb 2021 09:05:36 +0800
Subject: [PATCH 054/123] docs(bom/storage): fixed #216

---
 docs/bom/storage.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/storage.md b/docs/bom/storage.md
index 0d5723e..a79fa5f 100644
--- a/docs/bom/storage.md
+++ b/docs/bom/storage.md
@@ -86,7 +86,7 @@ window.localStorage.clear()
 
 ### Storage.key()
 
-`Storage.key()`接受一个整数作为参数（从零开始），返回该位置对应的键值。
+`Storage.key()`接受一个整数作为参数（从零开始），返回该位置对应的键名。
 
 ```javascript
 window.sessionStorage.setItem('key', 'value');

From 6ff80f283883616c460aa0bcc5b09f71369918db Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 24 Feb 2021 09:06:46 +0800
Subject: [PATCH 055/123] docs(bom/storage): fixed #216

---
 docs/bom/storage.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/storage.md b/docs/bom/storage.md
index a79fa5f..2eb48d2 100644
--- a/docs/bom/storage.md
+++ b/docs/bom/storage.md
@@ -86,7 +86,7 @@ window.localStorage.clear()
 
 ### Storage.key()
 
-`Storage.key()`接受一个整数作为参数（从零开始），返回该位置对应的键名。
+`Storage.key()`方法接受一个整数作为参数（从零开始），返回该位置对应的键名。
 
 ```javascript
 window.sessionStorage.setItem('key', 'value');

From ac09300fc250f2f251889f73af3ebb9961a24a9d Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 7 Mar 2021 13:36:26 +0800
Subject: [PATCH 056/123] docs(feat/error): edit text

---
 docs/features/error.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/features/error.md b/docs/features/error.md
index a361a99..7fc26b4 100644
--- a/docs/features/error.md
+++ b/docs/features/error.md
@@ -9,7 +9,7 @@ var err = new Error('出错了');
 err.message // "出错了"
 ```
 
-上面代码中，我们调用`Error`构造函数，生成一个实例对象`err`。`Error`构造函数接受一个参数，表示错误提示，可以从实例的`message`属性读到这个参数。抛出`Error`实例对象以后，整个程序就中断在发生错误的地方，不再往下执行。
+上面代码中，我们调用`Error()`构造函数，生成一个实例对象`err`。`Error()`构造函数接受一个参数，表示错误提示，可以从实例的`message`属性读到这个参数。抛出`Error`实例对象以后，整个程序就中断在发生错误的地方，不再往下执行。
 
 JavaScript 语言标准只提到，`Error`实例对象必须有`message`属性，表示出错时的提示信息，没有提到其他属性。大多数 JavaScript 引擎，对`Error`实例还提供`name`和`stack`属性，分别表示错误的名称和错误的堆栈，但它们是非标准的，不是每种实现都有。
 
@@ -105,7 +105,7 @@ new Array(-1)
 
 ```javascript
 new 123
-// Uncaught TypeError: number is not a func
+// Uncaught TypeError: 123 is not a constructor
 
 var obj = {};
 obj.unknownMethod()

From 78db1506f640718d71bedd6b09eb2b39a270b8d7 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Thu, 6 May 2021 20:36:38 +0000
Subject: [PATCH 057/123] build(deps): bump lodash from 4.17.20 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.20 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.20...4.17.21)

Signed-off-by: dependabot[bot] <support@github.com>
---
 package-lock.json | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 15444de..6e827eb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -805,9 +805,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.20",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
-      "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA=="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "log-symbols": {
       "version": "4.0.0",

From 3e1522e9dd2d8074b6c9a9a5c35b961049dd18ec Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 12 May 2021 00:06:00 +0800
Subject: [PATCH 058/123] refactor: update theme

---
 package-lock.json | 6 +++---
 package.json      | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 15444de..51bd6bb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -893,9 +893,9 @@
       "integrity": "sha1-Mswjj72pUEpmZVTkbZdlh8LA9Ww="
     },
     "loppo-theme-wangdoc": {
-      "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/loppo-theme-wangdoc/-/loppo-theme-wangdoc-0.5.1.tgz",
-      "integrity": "sha512-tgGNCZeoKCcKDvwDmuoaOW3FJ0Q3Zvjj4JwLqxtU+rAeFz0YIIc0ZCgm5jXcaFxa+V79RzTu/JZKJq+os4no4A=="
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/loppo-theme-wangdoc/-/loppo-theme-wangdoc-0.5.2.tgz",
+      "integrity": "sha512-IkRaTMb5rg4AUHIoLCOkv3zYtJtn7NnUui70c3uR0LHKJGRy2vNru+NjOOxsIAns1I8FnEew3F4Hktex+RiFxw=="
     },
     "lower-case": {
       "version": "1.1.4",
diff --git a/package.json b/package.json
index e610caa..0713b02 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,6 @@
     "gh-pages": "^3.1.0",
     "husky": "^4.3.8",
     "loppo": "^0.6.23",
-    "loppo-theme-wangdoc": "^0.5.1"
+    "loppo-theme-wangdoc": "^0.5.2"
   }
 }

From db30f689bffa1ec49085d6c9a070f0e08383896c Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 12 May 2021 00:08:11 +0800
Subject: [PATCH 059/123] docs(feature/error): fixed text

---
 docs/features/error.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/docs/features/error.md b/docs/features/error.md
index 7fc26b4..670e377 100644
--- a/docs/features/error.md
+++ b/docs/features/error.md
@@ -166,13 +166,15 @@ new UserError('这是自定义的错误！');
 `throw`语句的作用是手动中断程序执行，抛出一个错误。
 
 ```javascript
+var x = -1;
+
 if (x <= 0) {
   throw new Error('x 必须为正数');
 }
-// Uncaught ReferenceError: x is not defined
+// Uncaught Error: x 必须为正数
 ```
 
-上面代码中，如果变量`x`小于等于`0`，就手动抛出一个错误，告诉用户`x`的值不正确，整个程序就会在这里中断执行。可以看到，`throw`抛出的错误就是它的参数，这里是一个`Error`实例。
+上面代码中，如果变量`x`小于等于`0`，就手动抛出一个错误，告诉用户`x`的值不正确，整个程序就会在这里中断执行。可以看到，`throw`抛出的错误就是它的参数，这里是一个`Error`对象的实例。
 
 `throw`也可以抛出自定义错误。
 

From 4164309b0201bca8e91f70e871a06f1a4e58d6e1 Mon Sep 17 00:00:00 2001
From: mikusa <31799398+mikusaa@users.noreply.github.com>
Date: Sat, 15 May 2021 10:39:56 +0800
Subject: [PATCH 060/123] Update grammar.md

---
 docs/basic/grammar.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/basic/grammar.md b/docs/basic/grammar.md
index fdf6f33..a449c41 100644
--- a/docs/basic/grammar.md
+++ b/docs/basic/grammar.md
@@ -238,7 +238,7 @@ JavaScript 提供`if`结构和`switch`结构，完成条件判断，即只有满
 
 ### if 结构
 
-`if`结构先判断一个表达式的布尔值，然后根据布尔值的真伪，执行不同的语句。所谓布尔值，指的是 JavaScript 的两个特殊值，`true`表示真，`false`表示`伪`。
+`if`结构先判断一个表达式的布尔值，然后根据布尔值的真伪，执行不同的语句。所谓布尔值，指的是 JavaScript 的两个特殊值，`true`表示`真`，`false`表示`伪`。
 
 ```javascript
 if (布尔值)

From 2945da67858d2e1d93a8a08ed4d4eda94993b1a8 Mon Sep 17 00:00:00 2001
From: mikusa <31799398+mikusaa@users.noreply.github.com>
Date: Sat, 15 May 2021 18:06:54 +0800
Subject: [PATCH 061/123] Update function.md

---
 docs/types/function.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index 98811c8..9003c93 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -803,7 +803,7 @@ function(){ /* code */ }();
 // SyntaxError: Unexpected token (
 ```
 
-产生这个错误的原因是，`function`这个关键字即可以当作语句，也可以当作表达式。
+产生这个错误的原因是，`function`这个关键字既可以当作语句，也可以当作表达式。
 
 ```javascript
 // 语句

From fe154d41cdf69877db2eb5d6615be3dc9662af7e Mon Sep 17 00:00:00 2001
From: mikusa <31799398+mikusaa@users.noreply.github.com>
Date: Sat, 15 May 2021 18:14:23 +0800
Subject: [PATCH 062/123] =?UTF-8?q?=E8=AF=AD=E7=97=85=E4=BF=AE=E6=AD=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/types/function.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index 9003c93..d8e649e 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -948,7 +948,7 @@ a // 2
 
 上面代码中，严格模式下，`eval`内部还是改写了外部变量，可见安全风险依然存在。
 
-总之，`eval`的本质是在当前作用域之中，注入代码。由于安全风险和不利于 JavaScript 引擎优化执行速度，所以一般不推荐使用。通常情况下，`eval`最常见的场合是解析 JSON 数据的字符串，不过正确的做法应该是使用原生的`JSON.parse`方法。
+总之，`eval`的本质是在当前作用域之中，注入代码。由于安全风险和不利于 JavaScript 引擎优化执行速度，一般不推荐使用。通常情况下，`eval`最常见的场合是解析 JSON 数据的字符串，不过正确的做法应该是使用原生的`JSON.parse`方法。
 
 ### eval 的别名调用
 

From 68c05037ee746077afbd43fbec1a21d21c8bb559 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 19 May 2021 02:54:06 +0800
Subject: [PATCH 063/123] docs(basic/grammar): fix typo

---
 docs/basic/grammar.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/basic/grammar.md b/docs/basic/grammar.md
index a449c41..1611427 100644
--- a/docs/basic/grammar.md
+++ b/docs/basic/grammar.md
@@ -238,7 +238,7 @@ JavaScript 提供`if`结构和`switch`结构，完成条件判断，即只有满
 
 ### if 结构
 
-`if`结构先判断一个表达式的布尔值，然后根据布尔值的真伪，执行不同的语句。所谓布尔值，指的是 JavaScript 的两个特殊值，`true`表示`真`，`false`表示`伪`。
+`if`结构先判断一个表达式的布尔值，然后根据布尔值的真伪，执行不同的语句。所谓布尔值，指的是 JavaScript 的两个特殊值，`true`表示“真”，`false`表示“伪”。
 
 ```javascript
 if (布尔值)

From 9ca16cd97353659ee2528a49fd95ffa1db77bc9d Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 25 May 2021 13:31:18 +0800
Subject: [PATCH 064/123] docs(stdlib/array): edit text

---
 docs/stdlib/array.md | 42 +++++++++++++++++++++---------------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/docs/stdlib/array.md b/docs/stdlib/array.md
index caacce2..cd6cb45 100644
--- a/docs/stdlib/array.md
+++ b/docs/stdlib/array.md
@@ -446,7 +446,7 @@ a // [1, 2]
 
 ### map()
 
-`map`方法将数组的所有成员依次传入参数函数，然后把每一次的执行结果组成一个新数组返回。
+`map()`方法将数组的所有成员依次传入参数函数，然后把每一次的执行结果组成一个新数组返回。
 
 ```javascript
 var numbers = [1, 2, 3];
@@ -462,7 +462,7 @@ numbers
 
 上面代码中，`numbers`数组的所有成员依次执行参数函数，运行结果组成一个新数组返回，原数组没有变化。
 
-`map`方法接受一个函数作为参数。该函数调用时，`map`方法向它传入三个参数：当前成员、当前位置和数组本身。
+`map()`方法接受一个函数作为参数。该函数调用时，`map()`方法向它传入三个参数：当前成员、当前位置和数组本身。
 
 ```javascript
 [1, 2, 3].map(function(elem, index, arr) {
@@ -471,9 +471,9 @@ numbers
 // [0, 2, 6]
 ```
 
-上面代码中，`map`方法的回调函数有三个参数，`elem`为当前成员的值，`index`为当前成员的位置，`arr`为原数组（`[1, 2, 3]`）。
+上面代码中，`map()`方法的回调函数有三个参数，`elem`为当前成员的值，`index`为当前成员的位置，`arr`为原数组（`[1, 2, 3]`）。
 
-`map`方法还可以接受第二个参数，用来绑定回调函数内部的`this`变量（详见《this 变量》一章）。
+`map()`方法还可以接受第二个参数，用来绑定回调函数内部的`this`变量（详见《this 变量》一章）。
 
 ```javascript
 var arr = ['a', 'b', 'c'];
@@ -484,9 +484,9 @@ var arr = ['a', 'b', 'c'];
 // ['b', 'c']
 ```
 
-上面代码通过`map`方法的第二个参数，将回调函数内部的`this`对象，指向`arr`数组。
+上面代码通过`map()`方法的第二个参数，将回调函数内部的`this`对象，指向`arr`数组。
 
-如果数组有空位，`map`方法的回调函数在这个位置不会执行，会跳过数组的空位。
+如果数组有空位，`map()`方法的回调函数在这个位置不会执行，会跳过数组的空位。
 
 ```javascript
 var f = function (n) { return 'a' };
@@ -496,13 +496,13 @@ var f = function (n) { return 'a' };
 [1, , 2].map(f) // ["a", , "a"]
 ```
 
-上面代码中，`map`方法不会跳过`undefined`和`null`，但是会跳过空位。
+上面代码中，`map()`方法不会跳过`undefined`和`null`，但是会跳过空位。
 
 ### forEach()
 
-`forEach`方法与`map`方法很相似，也是对数组的所有成员依次执行参数函数。但是，`forEach`方法不返回值，只用来操作数据。这就是说，如果数组遍历的目的是为了得到返回值，那么使用`map`方法，否则使用`forEach`方法。
+`forEach()`方法与`map()`方法很相似，也是对数组的所有成员依次执行参数函数。但是，`forEach()`方法不返回值，只用来操作数据。这就是说，如果数组遍历的目的是为了得到返回值，那么使用`map()`方法，否则使用`forEach()`方法。
 
-`forEach`的用法与`map`方法一致，参数是一个函数，该函数同样接受三个参数：当前值、当前位置、整个数组。
+`forEach()`的用法与`map()`方法一致，参数是一个函数，该函数同样接受三个参数：当前值、当前位置、整个数组。
 
 ```javascript
 function log(element, index, array) {
@@ -515,9 +515,9 @@ function log(element, index, array) {
 // [2] = 9
 ```
 
-上面代码中，`forEach`遍历数组不是为了得到返回值，而是为了在屏幕输出内容，所以不必使用`map`方法。
+上面代码中，`forEach()`遍历数组不是为了得到返回值，而是为了在屏幕输出内容，所以不必使用`map()`方法。
 
-`forEach`方法也可以接受第二个参数，绑定参数函数的`this`变量。
+`forEach()`方法也可以接受第二个参数，绑定参数函数的`this`变量。
 
 ```javascript
 var out = [];
@@ -529,9 +529,9 @@ var out = [];
 out // [1, 4, 9]
 ```
 
-上面代码中，空数组`out`是`forEach`方法的第二个参数，结果，回调函数内部的`this`关键字就指向`out`。
+上面代码中，空数组`out`是`forEach()`方法的第二个参数，结果，回调函数内部的`this`关键字就指向`out`。
 
-注意，`forEach`方法无法中断执行，总是会将所有成员遍历完。如果希望符合某种条件时，就中断遍历，要使用`for`循环。
+注意，`forEach()`方法无法中断执行，总是会将所有成员遍历完。如果希望符合某种条件时，就中断遍历，要使用`for`循环。
 
 ```javascript
 var arr = [1, 2, 3];
@@ -543,9 +543,9 @@ for (var i = 0; i < arr.length; i++) {
 // 1
 ```
 
-上面代码中，执行到数组的第二个成员时，就会中断执行。`forEach`方法做不到这一点。
+上面代码中，执行到数组的第二个成员时，就会中断执行。`forEach()`方法做不到这一点。
 
-`forEach`方法也会跳过数组的空位。
+`forEach()`方法也会跳过数组的空位。
 
 ```javascript
 var log = function (n) {
@@ -567,11 +567,11 @@ var log = function (n) {
 // 3
 ```
 
-上面代码中，`forEach`方法不会跳过`undefined`和`null`，但会跳过空位。
+上面代码中，`forEach()`方法不会跳过`undefined`和`null`，但会跳过空位。
 
 ### filter()
 
-`filter`方法用于过滤数组成员，满足条件的成员组成一个新数组返回。
+`filter()`方法用于过滤数组成员，满足条件的成员组成一个新数组返回。
 
 它的参数是一个函数，所有数组成员依次执行该函数，返回结果为`true`的成员组成一个新数组返回。该方法不会改变原数组。
 
@@ -591,9 +591,9 @@ arr.filter(Boolean)
 // [1, "a"]
 ```
 
-上面代码中，`filter`方法返回数组`arr`里面所有布尔值为`true`的成员。
+上面代码中，`filter()`方法返回数组`arr`里面所有布尔值为`true`的成员。
 
-`filter`方法的参数函数可以接受三个参数：当前成员，当前位置和整个数组。
+`filter()`方法的参数函数可以接受三个参数：当前成员，当前位置和整个数组。
 
 ```javascript
 [1, 2, 3, 4, 5].filter(function (elem, index, arr) {
@@ -604,7 +604,7 @@ arr.filter(Boolean)
 
 上面代码返回偶数位置的成员组成的新数组。
 
-`filter`方法还可以接受第二个参数，用来绑定参数函数内部的`this`变量。
+`filter()`方法还可以接受第二个参数，用来绑定参数函数内部的`this`变量。
 
 ```javascript
 var obj = { MAX: 3 };
@@ -616,7 +616,7 @@ var arr = [2, 8, 3, 4, 1, 3, 2, 9];
 arr.filter(myFilter, obj) // [8, 4, 9]
 ```
 
-上面代码中，过滤器`myFilter`内部有`this`变量，它可以被`filter`方法的第二个参数`obj`绑定，返回大于`3`的成员。
+上面代码中，过滤器`myFilter()`内部有`this`变量，它可以被`filter()`方法的第二个参数`obj`绑定，返回大于`3`的成员。
 
 ### some()，every()
 

From bae4e98c83d2ac41f1b447f32fa251ff6bc10749 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 14 Jul 2021 16:26:05 +0800
Subject: [PATCH 065/123] docs(stdlib/attribute): fixed #226 edit configurable

---
 docs/stdlib/attributes.md | 18 +++++++++---------
 package-lock.json         | 12 ++++++------
 package.json              |  2 +-
 3 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/docs/stdlib/attributes.md b/docs/stdlib/attributes.md
index f1f3af6..cad729f 100644
--- a/docs/stdlib/attributes.md
+++ b/docs/stdlib/attributes.md
@@ -33,7 +33,7 @@ JavaScript 提供了一个内部数据结构，用来描述对象的属性，控
 
 （4）`configurable`
 
-`configurable`是一个布尔值，表示可配置性，默认为`true`。如果设为`false`，将阻止某些操作改写该属性，比如无法删除该属性，也不得改变该属性的属性描述对象（`value`属性除外）。也就是说，`configurable`属性控制了属性描述对象的可写性。
+`configurable`是一个布尔值，表示属性的可配置性，默认为`true`。如果设为`false`，将阻止某些操作改写属性描述对象，比如无法删除该属性，也不得改变各种元属性（`value`属性除外）。也就是说，`configurable`属性控制了属性描述对象的可写性。
 
 （5）`get`
 
@@ -350,7 +350,7 @@ JSON.stringify(obj) // "{}"
 
 ### configurable
 
-`configurable`(可配置性）返回一个布尔值，决定了是否可以修改属性描述对象。也就是说，`configurable`为`false`时，`value`、`writable`、`enumerable`和`configurable`都不能被修改了。
+`configurable`(可配置性）返回一个布尔值，决定了是否可以修改属性描述对象。也就是说，`configurable`为`false`时，`writable`、`enumerable`和`configurable`都不能被修改了。
 
 ```javascript
 var obj = Object.defineProperty({}, 'p', {
@@ -360,9 +360,6 @@ var obj = Object.defineProperty({}, 'p', {
   configurable: false
 });
 
-Object.defineProperty(obj, 'p', {value: 2})
-// TypeError: Cannot redefine property: p
-
 Object.defineProperty(obj, 'p', {writable: true})
 // TypeError: Cannot redefine property: p
 
@@ -371,11 +368,14 @@ Object.defineProperty(obj, 'p', {enumerable: true})
 
 Object.defineProperty(obj, 'p', {configurable: true})
 // TypeError: Cannot redefine property: p
+
+Object.defineProperty(obj, 'p', {value: 2})
+// TypeError: Cannot redefine property: p
 ```
 
-上面代码中，`obj.p`的`configurable`为`false`。然后，改动`value`、`writable`、`enumerable`、`configurable`，结果都报错。
+上面代码中，`obj.p`的`configurable`属性为`false`。然后，改动`writable`、`enumerable`、`configurable`，结果都报错。
 
-注意，`writable`只有在`false`改为`true`会报错，`true`改为`false`是允许的。
+注意，`writable`属性只有在`false`改为`true`时会报错，`true`改为`false`是允许的。
 
 ```javascript
 var obj = Object.defineProperty({}, 'p', {
@@ -387,7 +387,7 @@ Object.defineProperty(obj, 'p', {writable: false})
 // 修改成功
 ```
 
-至于`value`，只要`writable`和`configurable`有一个为`true`，就允许改动。
+`value`属性的情况比较特殊。只要`writable`和`configurable`有一个为`true`，就允许改动`value`。
 
 ```javascript
 var o1 = Object.defineProperty({}, 'p', {
@@ -409,7 +409,7 @@ Object.defineProperty(o2, 'p', {value: 2})
 // 修改成功
 ```
 
-另外，`writable`为`false`时，直接目标属性赋值，不报错，但不会成功。
+另外，`writable`为`false`时，直接对目标属性赋值，不报错，但不会成功。
 
 ```javascript
 var obj = Object.defineProperty({}, 'p', {
diff --git a/package-lock.json b/package-lock.json
index f76e307..b435362 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -526,9 +526,9 @@
       "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg=="
     },
     "gh-pages": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/gh-pages/-/gh-pages-3.1.0.tgz",
-      "integrity": "sha512-3b1rly9kuf3/dXsT8+ZxP0UhNLOo1CItj+3e31yUVcaph/yDsJ9RzD7JOw5o5zpBTJVQLlJAASNkUfepi9fe2w==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/gh-pages/-/gh-pages-3.2.0.tgz",
+      "integrity": "sha512-VQTwyRtxoaId0YmDXdC/G854dojpwTuOdpZUL3PGG6WQZvSoGVD8ggedKARZltixIREMezoDywE+g3g2paLxPw==",
       "requires": {
         "async": "^2.6.1",
         "commander": "^2.18.0",
@@ -548,9 +548,9 @@
       }
     },
     "glob": {
-      "version": "7.1.6",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
-      "integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==",
+      "version": "7.1.7",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.7.tgz",
+      "integrity": "sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==",
       "requires": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
diff --git a/package.json b/package.json
index 0713b02..fbb7e46 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   },
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
-    "gh-pages": "^3.1.0",
+    "gh-pages": "^3.2.0",
     "husky": "^4.3.8",
     "loppo": "^0.6.23",
     "loppo-theme-wangdoc": "^0.5.2"

From e90b8a13fcac3adde61252f46b91df43f851979c Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 21 Jul 2021 12:41:30 +0800
Subject: [PATCH 066/123] docs(stdlib/array): fixed #228 reduce()

---
 docs/stdlib/array.md | 47 +++++++++++++++--------
 package-lock.json    | 90 ++++++--------------------------------------
 package.json         |  2 +-
 3 files changed, 44 insertions(+), 95 deletions(-)

diff --git a/docs/stdlib/array.md b/docs/stdlib/array.md
index cd6cb45..e7b4359 100644
--- a/docs/stdlib/array.md
+++ b/docs/stdlib/array.md
@@ -1,4 +1,4 @@
- Array 对象
+# Array 对象
 
 ## 构造函数
 
@@ -661,7 +661,7 @@ function isEven(x) { return x % 2 === 0 }
 
 ### reduce()，reduceRight()
 
-`reduce`方法和`reduceRight`方法依次处理数组的每个成员，最终累计为一个值。它们的差别是，`reduce`是从左到右处理（从第一个成员到最后一个成员），`reduceRight`则是从右到左（从最后一个成员到第一个成员），其他完全一样。
+`reduce()`方法和`reduceRight()`方法依次处理数组的每个成员，最终累计为一个值。它们的差别是，`reduce()`是从左到右处理（从第一个成员到最后一个成员），`reduceRight()`则是从右到左（从最后一个成员到第一个成员），其他完全一样。
 
 ```javascript
 [1, 2, 3, 4, 5].reduce(function (a, b) {
@@ -675,18 +675,33 @@ function isEven(x) { return x % 2 === 0 }
 //最后结果：15
 ```
 
-上面代码中，`reduce`方法求出数组所有成员的和。第一次执行，`a`是数组的第一个成员`1`，`b`是数组的第二个成员`2`。第二次执行，`a`为上一轮的返回值`3`，`b`为第三个成员`3`。第三次执行，`a`为上一轮的返回值`6`，`b`为第四个成员`4`。第四次执行，`a`为上一轮返回值`10`，`b`为第五个成员`5`。至此所有成员遍历完成，整个方法的返回值就是最后一轮的返回值`15`。
+上面代码中，`reduce()`方法用来求出数组所有成员的和。`reduce()`的参数是一个函数，数组每个成员都会依次执行这个函数。如果数组有 n 个成员，这个参数函数就会执行 n - 1 次。
 
-`reduce`方法和`reduceRight`方法的第一个参数都是一个函数。该函数接受以下四个参数。
+- 第一次执行：`a`是数组的第一个成员`1`，`b`是数组的第二个成员`2`。
+- 第二次执行：`a`为上一轮的返回值`3`，`b`为第三个成员`3`。
+- 第三次执行：`a`为上一轮的返回值`6`，`b`为第四个成员`4`。
+- 第四次执行：`a`为上一轮返回值`10`，`b`为第五个成员`5`。至此所有成员遍历完成，整个方法的返回值就是最后一轮的返回值`15`。
 
-1. 累积变量，默认为数组的第一个成员
-2. 当前变量，默认为数组的第二个成员
-3. 当前位置（从0开始）
-4. 原数组
+`reduce()`方法和`reduceRight()`方法的第一个参数都是一个函数。该函数接受以下四个参数。
+
+1. 累积变量。第一次执行时，默认为数组的第一个成员；以后每次执行时，都是上一轮的返回值。
+2. 当前变量。第一次执行时，默认为数组的第二个成员；以后每次执行时，都是下一个成员。
+3. 当前位置。一个整数，表示第二个参数（当前变量）的位置，默认为`1`。
+4. 原数组。
 
 这四个参数之中，只有前两个是必须的，后两个则是可选的。
 
-如果要对累积变量指定初值，可以把它放在`reduce`方法和`reduceRight`方法的第二个参数。
+```javascript
+[1, 2, 3, 4, 5].reduce(function (
+  a,   // 累积变量，必须
+  b,   // 当前变量，必须
+  i,   // 当前位置，可选
+  arr  // 原数组，可选
+) {
+  // ... ...
+```
+
+如果要对累积变量指定初值，可以把它放在`reduce()`方法和`reduceRight()`方法的第二个参数。
 
 ```javascript
 [1, 2, 3, 4, 5].reduce(function (a, b) {
@@ -695,9 +710,9 @@ function isEven(x) { return x % 2 === 0 }
 // 25
 ```
 
-上面代码指定参数`a`的初值为10，所以数组从10开始累加，最终结果为25。注意，这时`b`是从数组的第一个成员开始遍历。
+上面代码指定参数`a`的初值为10，所以数组从10开始累加，最终结果为25。注意，这时`b`是从数组的第一个成员开始遍历，参数函数会执行5次。
 
-上面的第二个参数相当于设定了默认值，处理空数组时尤其有用。
+建议总是加上第二个参数，这样比较符合直觉，每个数组成员都会依次执行`reduce()`方法的参数函数。另外，第二个参数可以防止空数组报错。
 
 ```javascript
 function add(prev, cur) {
@@ -710,9 +725,9 @@ function add(prev, cur) {
 // 1
 ```
 
-上面代码中，由于空数组取不到初始值，`reduce`方法会报错。这时，加上第二个参数，就能保证总是会返回一个值。
+上面代码中，由于空数组取不到累积变量的初始值，`reduce()`方法会报错。这时，加上第二个参数，就能保证总是会返回一个值。
 
-下面是一个`reduceRight`方法的例子。
+下面是一个`reduceRight()`方法的例子。
 
 ```javascript
 function subtract(prev, cur) {
@@ -723,9 +738,9 @@ function subtract(prev, cur) {
 [3, 2, 1].reduceRight(subtract) // -4
 ```
 
-上面代码中，`reduce`方法相当于`3`减去`2`再减去`1`，`reduceRight`方法相当于`1`减去`2`再减去`3`。
+上面代码中，`reduce()`方法相当于`3`减去`2`再减去`1`，`reduceRight`方法相当于`1`减去`2`再减去`3`。
 
-由于这两个方法会遍历数组，所以实际上还可以用来做一些遍历相关的操作。比如，找出字符长度最长的数组成员。
+由于这两个方法会遍历数组，所以实际上可以用来做一些遍历相关的操作。比如，找出字符长度最长的数组成员。
 
 ```javascript
 function findLongest(entries) {
@@ -737,7 +752,7 @@ function findLongest(entries) {
 findLongest(['aaa', 'bb', 'c']) // "aaa"
 ```
 
-上面代码中，`reduce`的参数函数会将字符长度较长的那个数组成员，作为累积值。这导致遍历所有成员之后，累积值就是字符长度最长的那个成员。
+上面代码中，`reduce()`的参数函数会将字符长度较长的那个数组成员，作为累积值。这导致遍历所有成员之后，累积值就是字符长度最长的那个成员。
 
 ### indexOf()，lastIndexOf()
 
diff --git a/package-lock.json b/package-lock.json
index b435362..5c9e66e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -421,29 +421,20 @@
       "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
     },
     "filename-reserved-regex": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/filename-reserved-regex/-/filename-reserved-regex-1.0.0.tgz",
-      "integrity": "sha1-5hz4BfDeHJhFZ9A4bcXfUO5a9+Q="
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/filename-reserved-regex/-/filename-reserved-regex-2.0.0.tgz",
+      "integrity": "sha1-q/c9+rc10EVECr/qLZHzieu/oik="
     },
     "filenamify": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/filenamify/-/filenamify-1.2.1.tgz",
-      "integrity": "sha1-qfL/0RxQO+0wABUCknI3jx8TZaU=",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/filenamify/-/filenamify-4.3.0.tgz",
+      "integrity": "sha512-hcFKyUG57yWGAzu1CMt/dPzYZuv+jAJUT85bL8mrXvNe6hWj6yEHEc4EdcgiA6Z3oi1/9wXJdZPXF2dZNgwgOg==",
       "requires": {
-        "filename-reserved-regex": "^1.0.0",
-        "strip-outer": "^1.0.0",
+        "filename-reserved-regex": "^2.0.0",
+        "strip-outer": "^1.0.1",
         "trim-repeated": "^1.0.0"
       }
     },
-    "filenamify-url": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/filenamify-url/-/filenamify-url-1.0.0.tgz",
-      "integrity": "sha1-syvYExnvWGO3MHi+1Q9GpPeXX1A=",
-      "requires": {
-        "filenamify": "^1.0.0",
-        "humanize-url": "^1.0.0"
-      }
-    },
     "finalhandler": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
@@ -526,14 +517,14 @@
       "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg=="
     },
     "gh-pages": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/gh-pages/-/gh-pages-3.2.0.tgz",
-      "integrity": "sha512-VQTwyRtxoaId0YmDXdC/G854dojpwTuOdpZUL3PGG6WQZvSoGVD8ggedKARZltixIREMezoDywE+g3g2paLxPw==",
+      "version": "3.2.3",
+      "resolved": "https://registry.npmjs.org/gh-pages/-/gh-pages-3.2.3.tgz",
+      "integrity": "sha512-jA1PbapQ1jqzacECfjUaO9gV8uBgU6XNMV0oXLtfCX3haGLe5Atq8BxlrADhbD6/UdG9j6tZLWAkAybndOXTJg==",
       "requires": {
         "async": "^2.6.1",
         "commander": "^2.18.0",
         "email-addresses": "^3.0.1",
-        "filenamify-url": "^1.0.0",
+        "filenamify": "^4.3.0",
         "find-cache-dir": "^3.3.1",
         "fs-extra": "^8.1.0",
         "globby": "^6.1.0"
@@ -641,15 +632,6 @@
         "toidentifier": "1.0.0"
       }
     },
-    "humanize-url": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/humanize-url/-/humanize-url-1.0.1.tgz",
-      "integrity": "sha1-9KuZ4NKIF0yk4eUEB8VfuuRk7/8=",
-      "requires": {
-        "normalize-url": "^1.0.0",
-        "strip-url-auth": "^1.0.0"
-      }
-    },
     "husky": {
       "version": "4.3.8",
       "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.8.tgz",
@@ -743,11 +725,6 @@
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
       "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
     },
-    "is-plain-obj": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-1.1.0.tgz",
-      "integrity": "sha1-caUMhCnfync8kqOQpKA7OfzVHT4="
-    },
     "js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -1047,17 +1024,6 @@
         "lower-case": "^1.1.1"
       }
     },
-    "normalize-url": {
-      "version": "1.9.1",
-      "resolved": "https://registry.npmjs.org/normalize-url/-/normalize-url-1.9.1.tgz",
-      "integrity": "sha1-LMDWazHqIwNkWENuNiDYWVTGbDw=",
-      "requires": {
-        "object-assign": "^4.0.1",
-        "prepend-http": "^1.0.0",
-        "query-string": "^4.1.0",
-        "sort-keys": "^1.0.0"
-      }
-    },
     "object-assign": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
@@ -1186,11 +1152,6 @@
         "semver-compare": "^1.0.0"
       }
     },
-    "prepend-http": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/prepend-http/-/prepend-http-1.0.4.tgz",
-      "integrity": "sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw="
-    },
     "promptly": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/promptly/-/promptly-3.2.0.tgz",
@@ -1199,15 +1160,6 @@
         "read": "^1.0.4"
       }
     },
-    "query-string": {
-      "version": "4.3.4",
-      "resolved": "https://registry.npmjs.org/query-string/-/query-string-4.3.4.tgz",
-      "integrity": "sha1-u7aTucqRXCMlFbIosaArYJBD2+s=",
-      "requires": {
-        "object-assign": "^4.1.0",
-        "strict-uri-encode": "^1.0.0"
-      }
-    },
     "range-parser": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
@@ -1319,14 +1271,6 @@
       "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
       "integrity": "sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q=="
     },
-    "sort-keys": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/sort-keys/-/sort-keys-1.1.2.tgz",
-      "integrity": "sha1-RBttTTRnmPG05J6JIK37oOVD+a0=",
-      "requires": {
-        "is-plain-obj": "^1.0.0"
-      }
-    },
     "source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -1359,11 +1303,6 @@
         }
       }
     },
-    "strict-uri-encode": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
-      "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM="
-    },
     "string-width": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
@@ -1397,11 +1336,6 @@
         "escape-string-regexp": "^1.0.2"
       }
     },
-    "strip-url-auth": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/strip-url-auth/-/strip-url-auth-1.0.1.tgz",
-      "integrity": "sha1-IrD6OkE4WzO+PzMVUbu4N/oM164="
-    },
     "supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
diff --git a/package.json b/package.json
index fbb7e46..acd23bc 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   },
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
-    "gh-pages": "^3.2.0",
+    "gh-pages": "^3.2.3",
     "husky": "^4.3.8",
     "loppo": "^0.6.23",
     "loppo-theme-wangdoc": "^0.5.2"

From 95e72ae23c518f5f756e987646ce9dd7758733dc Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 5 Aug 2021 19:40:59 +0800
Subject: [PATCH 067/123] docs(dom/document): edit document.stylesheets

---
 docs/dom/document.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/dom/document.md b/docs/dom/document.md
index 46da3e9..3eb1d02 100644
--- a/docs/dom/document.md
+++ b/docs/dom/document.md
@@ -145,11 +145,11 @@ if (scripts.length !== 0 ) {
 
 **（6）document.styleSheets**
 
-`document.styleSheets`属性返回文档内嵌或引入的样式表集合，详细介绍请看《CSS 对象模型》一章。
+`document.styleSheets`属性返回网页内嵌或引入的 CSS 样式表集合，详细介绍请看《CSS 操作》一章。
 
 **（7）小结**
 
-除了`document.styleSheets`，以上的集合属性返回的都是`HTMLCollection`实例。
+除了`document.styleSheets`属性，以上的其他集合属性返回的都是`HTMLCollection`实例。`document.styleSheets`属性返回的是`StyleSheetList`实例。
 
 ```javascript
 document.links instanceof HTMLCollection // true
@@ -159,7 +159,7 @@ document.embeds instanceof HTMLCollection // true
 document.scripts instanceof HTMLCollection // true
 ```
 
-`HTMLCollection`实例是类似数组的对象，所以这些属性都有`length`属性，都可以使用方括号运算符引用成员。如果成员有`id`或`name`属性，还可以用这两个属性的值，在`HTMLCollection`实例上引用到这个成员。
+`HTMLCollection`实例是类似数组的对象，所以上面这些属性都有`length`属性，都可以使用方括号运算符引用成员。如果成员有`id`或`name`属性，还可以用这两个属性的值，在`HTMLCollection`实例上引用到这个成员。
 
 ```javascript
 // HTML 代码如下

From 3d8337c0f57f5119254f52c7074b21620cced061 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 10 Aug 2021 00:56:10 +0800
Subject: [PATCH 068/123] docs(dom/mutationobserver): fix typo

---
 docs/dom/mutationobserver.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/dom/mutationobserver.md b/docs/dom/mutationobserver.md
index 12651c2..ace5853 100644
--- a/docs/dom/mutationobserver.md
+++ b/docs/dom/mutationobserver.md
@@ -98,7 +98,7 @@ var observer = new MutationObserver(function(mutations) {
 observer.observe(document, { childList: true, subtree: true });
 ```
 
-### disconnect()，takeRecords（）
+### disconnect()，takeRecords()
 
 `disconnect()`方法用来停止观察。调用该方法后，DOM 再发生变动，也不会触发观察器。
 

From 5d7484cdadfe9a7e47d0ff579d8bed5eda30f170 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 10 Aug 2021 01:38:06 +0800
Subject: [PATCH 069/123] docs(event/eventTarget): fixed #231

---
 docs/events/eventtarget.md | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/docs/events/eventtarget.md b/docs/events/eventtarget.md
index 40de255..da89d9a 100644
--- a/docs/events/eventtarget.md
+++ b/docs/events/eventtarget.md
@@ -8,25 +8,33 @@ DOM 的事件操作（监听和触发），都定义在`EventTarget`接口。所
 
 该接口主要提供三个实例方法。
 
-- `addEventListener`：绑定事件的监听函数
-- `removeEventListener`：移除事件的监听函数
-- `dispatchEvent`：触发事件
+- `addEventListener()`：绑定事件的监听函数
+- `removeEventListener()`：移除事件的监听函数
+- `dispatchEvent()`：触发事件
 
 ## EventTarget.addEventListener()
 
-`EventTarget.addEventListener()`用于在当前节点或对象上，定义一个特定事件的监听函数。一旦这个事件发生，就会执行监听函数。该方法没有返回值。
+`EventTarget.addEventListener()`用于在当前节点或对象上（即部署了 EventTarget 接口的对象），定义一个特定事件的监听函数。一旦这个事件发生，就会执行监听函数。该方法没有返回值。
 
 ```javascript
+targent.addEventListener(type, listener[, options]);
+// 或者
 target.addEventListener(type, listener[, useCapture]);
 ```
 
-该方法接受三个参数。
+该方法接受三个参数，前两个参数的含义如下。
 
 - `type`：事件名称，大小写敏感。
 - `listener`：监听函数。事件发生时，会调用该监听函数。
-- `useCapture`：布尔值，表示监听函数是否在捕获阶段（capture）触发（参见后文《事件的传播》部分），默认为`false`（监听函数只在冒泡阶段被触发）。该参数可选。
 
-下面是一个例子。
+第三个参数有两种形式。如果是一个对象`options`，表示监听器的配置对象，用来对监听行为进行配置，有以下属性。
+
+- `capture`：布尔值，如果设为`true`，表示监听函数在捕获阶段触发，默认为`false`，在冒泡阶段触发。
+- `once`：布尔值，如果设为`true`，表示监听函数触发后，只执行一次就会被移除。同样事件再次发生时，该监听函数将不存在。该属性默认值为`false`。
+- `passive`：布尔值，设为`true`时，表示监听函数不会调用`preventDefault()`阻止浏览器的默认行为，如果调用这个函数，将没有任何效果，并且控制台会打印一条报错信息。这个属性默认值为`false`。
+- `signal`：该属性的值为一个 AbortSignal 对象，为监听器设置了一个信号通道，用来在需要时发出信号，移除监听函数。
+
+第三个参数如果是一个布尔值`useCapture`，则表示监听函数是否在捕获阶段（capture）触发（参见后文《事件的传播》部分）。该参数可选，默认值为`false`（监听函数只在冒泡阶段被触发）。下面是一个例子。
 
 ```javascript
 function hello() {

From 3e1a5b67650be107635f8ae3146cf4e5cbd97315 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 10 Aug 2021 08:46:14 +0800
Subject: [PATCH 070/123] docs(event/eventtarget): edit text

---
 docs/events/eventtarget.md | 56 ++++++++++++++++++--------------------
 1 file changed, 26 insertions(+), 30 deletions(-)

diff --git a/docs/events/eventtarget.md b/docs/events/eventtarget.md
index da89d9a..ca69057 100644
--- a/docs/events/eventtarget.md
+++ b/docs/events/eventtarget.md
@@ -2,9 +2,11 @@
 
 事件的本质是程序各个组成部分之间的一种通信方式，也是异步编程的一种实现。DOM 支持大量的事件，本章开始介绍 DOM 的事件编程。
 
+介绍具体的事件之前，先来看看如何让 DOM 节点监听事件。
+
 ## 概述
 
-DOM 的事件操作（监听和触发），都定义在`EventTarget`接口。所有节点对象都部署了这个接口，其他一些需要事件通信的浏览器内置对象（比如，`XMLHttpRequest`、`AudioNode`、`AudioContext`）也部署了这个接口。
+DOM 节点的事件操作（监听和触发），都定义在`EventTarget`接口。所有节点对象都部署了这个接口，其他一些需要事件通信的浏览器内置对象（比如，`XMLHttpRequest`、`AudioNode`、`AudioContext`）也部署了这个接口。
 
 该接口主要提供三个实例方法。
 
@@ -17,24 +19,16 @@ DOM 的事件操作（监听和触发），都定义在`EventTarget`接口。所
 `EventTarget.addEventListener()`用于在当前节点或对象上（即部署了 EventTarget 接口的对象），定义一个特定事件的监听函数。一旦这个事件发生，就会执行监听函数。该方法没有返回值。
 
 ```javascript
-targent.addEventListener(type, listener[, options]);
-// 或者
 target.addEventListener(type, listener[, useCapture]);
 ```
 
-该方法接受三个参数，前两个参数的含义如下。
+该方法接受三个参数。
 
 - `type`：事件名称，大小写敏感。
 - `listener`：监听函数。事件发生时，会调用该监听函数。
+- `useCapture`：布尔值，如果设为`true`，表示监听函数将在捕获阶段（capture）触发（参见后文《事件的传播》部分）。该参数可选，默认值为`false`（监听函数只在冒泡阶段被触发）。
 
-第三个参数有两种形式。如果是一个对象`options`，表示监听器的配置对象，用来对监听行为进行配置，有以下属性。
-
-- `capture`：布尔值，如果设为`true`，表示监听函数在捕获阶段触发，默认为`false`，在冒泡阶段触发。
-- `once`：布尔值，如果设为`true`，表示监听函数触发后，只执行一次就会被移除。同样事件再次发生时，该监听函数将不存在。该属性默认值为`false`。
-- `passive`：布尔值，设为`true`时，表示监听函数不会调用`preventDefault()`阻止浏览器的默认行为，如果调用这个函数，将没有任何效果，并且控制台会打印一条报错信息。这个属性默认值为`false`。
-- `signal`：该属性的值为一个 AbortSignal 对象，为监听器设置了一个信号通道，用来在需要时发出信号，移除监听函数。
-
-第三个参数如果是一个布尔值`useCapture`，则表示监听函数是否在捕获阶段（capture）触发（参见后文《事件的传播》部分）。该参数可选，默认值为`false`（监听函数只在冒泡阶段被触发）。下面是一个例子。
+下面是一个例子。
 
 ```javascript
 function hello() {
@@ -45,11 +39,11 @@ var button = document.getElementById('btn');
 button.addEventListener('click', hello, false);
 ```
 
-上面代码中，`button`节点的`addEventListener`方法绑定`click`事件的监听函数`hello`，该函数只在冒泡阶段触发。
+上面代码中，`button`节点的`addEventListener()`方法绑定`click`事件的监听函数`hello()`，该函数只在冒泡阶段触发。
 
 关于参数，有两个地方需要注意。
 
-首先，第二个参数除了监听函数，还可以是一个具有`handleEvent`方法的对象。
+首先，第二个参数除了监听函数，还可以是一个具有`handleEvent`方法的对象，效果与监听函数一样。
 
 ```javascript
 buttonElement.addEventListener('click', {
@@ -59,15 +53,16 @@ buttonElement.addEventListener('click', {
 });
 ```
 
-上面代码中，`addEventListener`方法的第二个参数，就是一个具有`handleEvent`方法的对象。
+上面代码中，`addEventListener()`方法的第二个参数，就是一个具有`handleEvent()`方法的对象。
 
-其次，第三个参数除了布尔值`useCapture`，还可以是一个属性配置对象。该对象有以下属性。
+其次，第三个参数除了布尔值`useCapture`，还可以是一个监听器配置对象，定制事件监听行为。该对象有以下属性。
 
-> - `capture`：布尔值，表示该事件是否在`捕获阶段`触发监听函数。
-> - `once`：布尔值，表示监听函数是否只触发一次，然后就自动移除。
-> - `passive`：布尔值，表示监听函数不会调用事件的`preventDefault`方法。如果监听函数调用了，浏览器将忽略这个要求，并在监控台输出一行警告。
+> - `capture`：布尔值，如果设为`true`，表示监听函数在捕获阶段触发，默认为`false`，在冒泡阶段触发。
+> - `once`：布尔值，如果设为`true`，表示监听函数执行一次就会自动移除，后面将不再监听该事件。该属性默认值为`false`。
+> - `passive`：布尔值，设为`true`时，表示禁止监听函数调用`preventDefault()`方法。如果调用了，浏览器将忽略这个要求，并在控制台输出一条警告。该属性默认值为`false`。
+> - `signal`：该属性的值为一个 AbortSignal 对象，为监听器设置了一个信号通道，用来在需要时发出信号，移除监听函数。
 
-如果希望事件监听函数只执行一次，可以打开属性配置对象的`once`属性。
+下面是`once`属性的例子，让监听函数只执行一次。
 
 ```javascript
 element.addEventListener('click', function (event) {
@@ -75,7 +70,7 @@ element.addEventListener('click', function (event) {
 }, {once: true});
 ```
 
-`addEventListener`方法可以为针对当前对象的同一个事件，添加多个不同的监听函数。这些函数按照添加顺序触发，即先添加先触发。如果为同一个事件多次添加同一个监听函数，该函数只会执行一次，多余的添加将自动被去除（不必使用`removeEventListener`方法手动去除）。
+`addEventListener()`方法可以为针对当前对象的同一个事件，添加多个不同的监听函数。这些函数按照添加顺序触发，即先添加先触发。如果为同一个事件多次添加同一个监听函数，该函数只会执行一次，多余的添加将自动被去除（不必使用`removeEventListener()`方法手动去除）。
 
 ```javascript
 function hello() {
@@ -116,40 +111,40 @@ para.addEventListener('click', function (e) {
 
 ## EventTarget.removeEventListener()
 
-`EventTarget.removeEventListener`方法用来移除`addEventListener`方法添加的事件监听函数。该方法没有返回值。
+`EventTarget.removeEventListener()`方法用来移除`addEventListener()`方法添加的事件监听函数。该方法没有返回值。
 
 ```javascript
 div.addEventListener('click', listener, false);
 div.removeEventListener('click', listener, false);
 ```
 
-`removeEventListener`方法的参数，与`addEventListener`方法完全一致。它的第一个参数“事件类型”，大小写敏感。
+`removeEventListener()`方法的参数，与`addEventListener()`方法完全一致。它的第一个参数“事件类型”，大小写敏感。
 
-注意，`removeEventListener`方法移除的监听函数，必须是`addEventListener`方法添加的那个监听函数，而且必须在同一个元素节点，否则无效。
+注意，`removeEventListener()`方法移除的监听函数，必须是`addEventListener()`方法添加的那个监听函数，而且必须在同一个元素节点，否则无效。
 
 ```javascript
 div.addEventListener('click', function (e) {}, false);
 div.removeEventListener('click', function (e) {}, false);
 ```
 
-上面代码中，`removeEventListener`方法无效，因为监听函数不是同一个匿名函数。
+上面代码中，`removeEventListener()`方法无效，因为监听函数不是同一个匿名函数。
 
 ```javascript
 element.addEventListener('mousedown', handleMouseDown, true);
 element.removeEventListener("mousedown", handleMouseDown, false);
 ```
 
-上面代码中，`removeEventListener`方法也是无效的，因为第三个参数不一样。
+上面代码中，`removeEventListener()`方法也是无效的，因为第三个参数不一样。
 
 ## EventTarget.dispatchEvent()
 
-`EventTarget.dispatchEvent`方法在当前节点上触发指定事件，从而触发监听函数的执行。该方法返回一个布尔值，只要有一个监听函数调用了`Event.preventDefault()`，则返回值为`false`，否则为`true`。
+`EventTarget.dispatchEvent()`方法在当前节点上触发指定事件，从而触发监听函数的执行。该方法返回一个布尔值，只要有一个监听函数调用了`Event.preventDefault()`，则返回值为`false`，否则为`true`。
 
 ```javascript
 target.dispatchEvent(event)
 ```
 
-`dispatchEvent`方法的参数是一个`Event`对象的实例（详见《Event 对象》章节）。
+`dispatchEvent()`方法的参数是一个`Event`对象的实例（详见《Event 对象》章节）。
 
 ```javascript
 para.addEventListener('click', hello, false);
@@ -159,9 +154,9 @@ para.dispatchEvent(event);
 
 上面代码在当前节点触发了`click`事件。
 
-如果`dispatchEvent`方法的参数为空，或者不是一个有效的事件对象，将报错。
+如果`dispatchEvent()`方法的参数为空，或者不是一个有效的事件对象，将报错。
 
-下面代码根据`dispatchEvent`方法的返回值，判断事件是否被取消了。
+下面代码根据`dispatchEvent()`方法的返回值，判断事件是否被取消了。
 
 ```javascript
 var canceled = !cb.dispatchEvent(event);
@@ -171,3 +166,4 @@ if (canceled) {
   console.log('事件未取消');
 }
 ```
+

From c506408445cbe0426f74e8988a1f3c921589501d Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 17 Aug 2021 17:41:01 +0800
Subject: [PATCH 071/123] docs(event/mouse): edit text

---
 docs/events/mouse.md | 39 ++++++++++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 13 deletions(-)

diff --git a/docs/events/mouse.md b/docs/events/mouse.md
index 177217d..31aeb34 100644
--- a/docs/events/mouse.md
+++ b/docs/events/mouse.md
@@ -2,23 +2,30 @@
 
 ## 鼠标事件的种类
 
-鼠标事件指与鼠标相关的事件，继承了`MouseEvent`接口。具体的事件主要有以下一些。
+鼠标事件主要有下面这些，所有事件都继承了`MouseEvent`接口（详见后文）。
+
+（1）点击事件
+
+鼠标点击相关的有四个事件。
 
 - `click`：按下鼠标（通常是按下主按钮）时触发。
 - `dblclick`：在同一个元素上双击鼠标时触发。
 - `mousedown`：按下鼠标键时触发。
 - `mouseup`：释放按下的鼠标键时触发。
+
+`click`事件可以看成是两个事件组成的：用户在同一个位置先触发`mousedown`，再触发`mouseup`。因此，触发顺序是，`mousedown`首先触发，`mouseup`接着触发，`click`最后触发。
+
+双击时，`dblclick`事件则会在`mousedown`、`mouseup`、`click`之后触发。
+
+（2）移动事件
+
+鼠标移动相关的有五个事件。
+
 - `mousemove`：当鼠标在一个节点内部移动时触发。当鼠标持续移动时，该事件会连续触发。为了避免性能问题，建议对该事件的监听函数做一些限定，比如限定一段时间内只能运行一次。
 - `mouseenter`：鼠标进入一个节点时触发，进入子节点不会触发这个事件（详见后文）。
 - `mouseover`：鼠标进入一个节点时触发，进入子节点会再一次触发这个事件（详见后文）。
 - `mouseout`：鼠标离开一个节点时触发，离开父节点也会触发这个事件（详见后文）。
 - `mouseleave`：鼠标离开一个节点时触发，离开父节点不会触发这个事件（详见后文）。
-- `contextmenu`：按下鼠标右键时（上下文菜单出现前）触发，或者按下“上下文菜单键”时触发。
-- `wheel`：滚动鼠标的滚轮时触发，该事件继承的是`WheelEvent`接口。
-
-`click`事件指的是，用户在同一个位置先完成`mousedown`动作，再完成`mouseup`动作。因此，触发顺序是，`mousedown`首先触发，`mouseup`接着触发，`click`最后触发。
-
-`dblclick`事件则会在`mousedown`、`mouseup`、`click`之后触发。
 
 `mouseover`事件和`mouseenter`事件，都是鼠标进入一个节点时触发。两者的区别是，`mouseenter`事件只触发一次，而只要鼠标在节点内部移动，`mouseover`事件会在子节点上触发多次。
 
@@ -27,7 +34,7 @@
  <ul>
    <li>item 1</li>
    <li>item 2</li>
-  <li>item 3</li>
+   <li>item 3</li>
  </ul>
 */
 
@@ -62,7 +69,7 @@ ul.addEventListener('mouseover', function (event) {
  <ul>
    <li>item 1</li>
    <li>item 2</li>
-  <li>item 3</li>
+   <li>item 3</li>
  </ul>
 */
 
@@ -90,19 +97,24 @@ ul.addEventListener('mouseout', function (event) {
 
 上面代码中，在父节点内部离开子节点，不会触发`mouseleave`事件，但是会触发`mouseout`事件。
 
-## MouseEvent 接口概述
+（3）其他事件
+
+- `contextmenu`：按下鼠标右键时（上下文菜单出现前）触发，或者按下“上下文”菜单键时触发。
+- `wheel`：滚动鼠标的滚轮时触发，该事件继承的是`WheelEvent`接口。
+
+## MouseEvent 接口
 
 `MouseEvent`接口代表了鼠标相关的事件，单击（click）、双击（dblclick）、松开鼠标键（mouseup）、按下鼠标键（mousedown）等动作，所产生的事件对象都是`MouseEvent`实例。此外，滚轮事件和拖拉事件也是`MouseEvent`实例。
 
-`MouseEvent`接口继承了`Event`接口，所以拥有`Event`的所有属性和方法。它还有自己的属性和方法。
+`MouseEvent`接口继承了`Event`接口，所以拥有`Event`的所有属性和方法，并且还提供鼠标独有的属性和方法。
 
-浏览器原生提供一个`MouseEvent`构造函数，用于新建一个`MouseEvent`实例。
+浏览器原生提供一个`MouseEvent()`构造函数，用于新建一个`MouseEvent`实例。
 
 ```javascript
 var event = new MouseEvent(type, options);
 ```
 
-`MouseEvent`构造函数接受两个参数。第一个参数是字符串，表示事件名称；第二个参数是一个事件配置对象，该参数可选。除了`Event`接口的实例配置属性，该对象可以配置以下属性，所有属性都是可选的。
+`MouseEvent()`构造函数接受两个参数。第一个参数是字符串，表示事件名称；第二个参数是一个事件配置对象，该参数可选。除了`Event`接口的实例配置属性，该对象可以配置以下属性，所有属性都是可选的。
 
 - `screenX`：数值，鼠标相对于屏幕的水平位置（单位像素），默认值为0，设置该属性不会移动鼠标。
 - `screenY`：数值，鼠标相对于屏幕的垂直位置（单位像素），其他与`screenX`相同。
@@ -384,3 +396,4 @@ var wheelEvent = new WheelEvent(type, options);
 - `WheelEvent.deltaY`：数值，表示滚轮的垂直滚动量。
 - `WheelEvent.deltaZ`：数值，表示滚轮的 Z 轴滚动量。
 - `WheelEvent.deltaMode`：数值，表示上面三个属性的单位，`0`是像素，`1`是行，`2`是页。
+

From e0f60d423f773ac8cd1fd692e98552a96e6a8708 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 17 Aug 2021 17:50:00 +0800
Subject: [PATCH 072/123] docs(event/mouse): edit text

---
 docs/events/mouse.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/events/mouse.md b/docs/events/mouse.md
index 31aeb34..cd1d463 100644
--- a/docs/events/mouse.md
+++ b/docs/events/mouse.md
@@ -337,10 +337,10 @@ inner.addEventListener('mouseover', function (event) {
 inner.addEventListener('mouseenter', function (event) {
   console.log('进入' + event.target.id + ' 离开' + event.relatedTarget.id);
 });
-inner.addEventListener('mouseout', function () {
+inner.addEventListener('mouseout', function (event) {
   console.log('离开' + event.target.id + ' 进入' + event.relatedTarget.id);
 });
-inner.addEventListener("mouseleave", function (){
+inner.addEventListener("mouseleave", function (event){
   console.log('离开' + event.target.id + ' 进入' + event.relatedTarget.id);
 });
 

From 24b53538310a2eaca5e623f7549408610f067bbc Mon Sep 17 00:00:00 2001
From: Ruan YiFeng <yifeng.ruan@gmail.com>
Date: Wed, 25 Aug 2021 00:22:23 +0800
Subject: [PATCH 073/123] docs: fix typo

---
 docs/async/general.md | 2 +-
 docs/bom/history.md   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/async/general.md b/docs/async/general.md
index d025df7..a4c9747 100644
--- a/docs/async/general.md
+++ b/docs/async/general.md
@@ -12,7 +12,7 @@ JavaScript 之所以采用单线程，而不是多线程，跟历史有关系。
 
 如果排队是因为计算量大，CPU 忙不过来，倒也算了，但是很多时候 CPU 是闲着的，因为 IO 操作（输入输出）很慢（比如 Ajax 操作从网络读取数据），不得不等着结果出来，再往下执行。JavaScript 语言的设计者意识到，这时 CPU 完全可以不管 IO 操作，挂起处于等待中的任务，先运行排在后面的任务。等到 IO 操作返回了结果，再回过头，把挂起的任务继续执行下去。这种机制就是 JavaScript 内部采用的“事件循环”机制（Event Loop）。
 
-单线程模型虽然对 JavaScript 构成了很大的限制，但也因此使它具备了其他语言不具备的优势。如果用得好，JavaScript 程序是不会出现堵塞的，这就是为什么 Node 可以用很少的资源，应付大流量访问的原因。
+单线程模型虽然对 JavaScript 构成了很大的限制，但也因此使它具备了其他语言不具备的优势。如果用得好，JavaScript 程序是不会出现堵塞的，这就是 Node.js 可以用很少的资源，应付大流量访问的原因。
 
 为了利用多核 CPU 的计算能力，HTML5 提出 Web Worker 标准，允许 JavaScript 脚本创建多个线程，但是子线程完全受主线程控制，且不得操作 DOM。所以，这个新标准并没有改变 JavaScript 单线程的本质。
 
diff --git a/docs/bom/history.md b/docs/bom/history.md
index 764b4bd..174f268 100644
--- a/docs/bom/history.md
+++ b/docs/bom/history.md
@@ -62,7 +62,7 @@ history.go(0); // 刷新当前页面
 
 注意，移动到以前访问过的页面时，页面通常是从浏览器缓存之中加载，而不是重新要求服务器发送新的网页。
 
-### History.pushState()，
+### History.pushState()
 
 `History.pushState()`方法用于在历史中添加一条记录。
 

From 76f46763d8d7f3974eaa59944a177b85797e42cb Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 1 Sep 2021 14:43:33 +0800
Subject: [PATCH 074/123] docs(bom/indexedDB): edit IDBCursor

---
 docs/bom/indexeddb.md | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/docs/bom/indexeddb.md b/docs/bom/indexeddb.md
index 83b5a86..7472264 100644
--- a/docs/bom/indexeddb.md
+++ b/docs/bom/indexeddb.md
@@ -932,15 +932,14 @@ objectStore.openCursor(null, 'next').onsuccess = function(event) {
   var cursor = event.target.result;
   if (cursor) {
     var listItem = document.createElement('li');
-      listItem.innerHTML = cursor.value.albumTitle + ', ' + cursor.value.year;
-      list.appendChild(listItem);
+    listItem.innerHTML = cursor.value.albumTitle + ', ' + cursor.value.year;
+    list.appendChild(listItem);
 
-      console.log(cursor.source);
-      cursor.continue();
-    } else {
-      console.log('Entries all displayed.');
-    }
-  };
+    console.log(cursor.source);
+    cursor.continue();
+  } else {
+    console.log('Entries all displayed.');
+  }
 };
 ```
 

From 9d3c01a61c3e9331d1c140c2a092d5b52f897a39 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 1 Sep 2021 15:28:25 +0800
Subject: [PATCH 075/123] docs(elements/video): edit HTMLMediaElement.src

---
 docs/elements/video.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/elements/video.md b/docs/elements/video.md
index 1625b70..73be5d6 100644
--- a/docs/elements/video.md
+++ b/docs/elements/video.md
@@ -56,7 +56,7 @@
 - HTMLMediaElement.readyState：整数，表示媒体文件的准备状态，可能的值为0（没有任何数据）、1（已获取元数据）、2（可播放当前帧，但不足以播放多个帧）、3（可以播放多帧，至少为两帧）、4（可以流畅播放）。该属性只读。
 - HTMLMediaElement.seekable：返回一个 TimeRanges 对象，表示一个用户可以搜索的媒体内容范围。该属性只读。
 - HTMLMediaElement.seeking：布尔值，表示媒体文件是否正在寻找新位置。该属性只读。
-- HTMLMediaElement.src：布尔值，表示媒体文件的 URL，对应 HTML 属性`src`。
+- HTMLMediaElement.src：字符串，表示媒体文件所在的 URL，对应 HTML 属性`src`。
 - HTMLMediaElement.srcObject：返回`src`属性对应的媒体文件资源，可能是`MediaStream`、`MediaSource`、`Blob`或`File`对象。直接指定这个属性，就可以播放媒体文件。
 - HTMLMediaElement.textTracks：返回一个类似数组的对象，包含所有文本轨道。该属性只读。
 - HTMLMediaElement.videoTracks：返回一个类似数组的对象，包含多有视频轨道。该属性只读。

From 4ba7e4048ad15c0a9cb0394d188ec897790dd128 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 5 Sep 2021 10:54:24 +0800
Subject: [PATCH 076/123] refactor: edit theme

---
 .gitignore        |   1 +
 package-lock.json | 246 +++++++++++++++++++++++++---------------------
 package.json      |   4 +-
 3 files changed, 136 insertions(+), 115 deletions(-)

diff --git a/.gitignore b/.gitignore
index c5ea0d4..01a7204 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 node_modules/
 dist/
 npm-debug.log
+package-lock.json
diff --git a/package-lock.json b/package-lock.json
index 5c9e66e..9afdca7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -82,9 +82,9 @@
       }
     },
     "@types/minimatch": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
-      "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA=="
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.5.tgz",
+      "integrity": "sha512-Klz949h02Gz2uZCMGwDUSDS1YBlTdDDgbWHi+81l29tQALUtvz4rAYi5uoVhE5Lagoq6DeqAUlbrHvW/mXDgdQ=="
     },
     "@types/parse-json": {
       "version": "4.0.0",
@@ -275,9 +275,9 @@
       "integrity": "sha512-eyTcpKOcamdhWJXj56DpQMo1ylSQpcGtGKXcU0Tb97+K56/CF5amAqqqNj0+KvA0iw2ynxtHWFsPDSClCxe48w=="
     },
     "debug": {
-      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
-      "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
+      "version": "4.3.2",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.2.tgz",
+      "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
       "requires": {
         "ms": "2.1.2"
       },
@@ -305,29 +305,29 @@
       "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
     },
     "dom-serializer": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.2.0.tgz",
-      "integrity": "sha512-n6kZFH/KlCrqs/1GHMOd5i2fd/beQHuehKdWvNNffbGHTr/almdhuVvTVFb3V7fglz+nC50fFusu3lY33h12pA==",
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.3.2.tgz",
+      "integrity": "sha512-5c54Bk5Dw4qAxNOI1pFEizPSjVsx5+bpJKmL2kPn8JhBUq2q09tTCa3mjijun2NfK78NMouDYNMBkOrPZiS+ig==",
       "requires": {
         "domelementtype": "^2.0.1",
-        "domhandler": "^4.0.0",
+        "domhandler": "^4.2.0",
         "entities": "^2.0.0"
       },
       "dependencies": {
         "domhandler": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-4.0.0.tgz",
-          "integrity": "sha512-KPTbnGQ1JeEMQyO1iYXoagsI6so/C96HZiFyByU3T6iAzpXn8EGEvct6unm1ZGoed8ByO2oirxgwxBmqKF9haA==",
+          "version": "4.2.2",
+          "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-4.2.2.tgz",
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+      "integrity": "sha512-NbjUvtMTvt1jqDdTZLpCZA6c3R0Zcd59cwKIohd4+XhEr+s/Nui/KOfytKA+ba/IVw3puAwzawkgrJtL5o29Gw==",
       "requires": {
         "@iktakahiro/markdown-it-katex": "^4.0.1",
         "clone": "^2.1.1",
-        "github-slugger": "^1.1.1",
-        "highlight.js": "^10.4.1",
-        "markdown-it": "^12.0.1",
+        "github-slugger": "^1.4.0",
+        "highlight.js": "^10.7.3",
+        "markdown-it": "^12.2.0",
         "markdown-it-abbr": "^1.0.4",
         "markdown-it-container": "^3.0.0",
         "markdown-it-deflist": "^2.0.1",
         "markdown-it-emoji": "^2.0.0",
-        "markdown-it-footnote": "^3.0.1",
+        "markdown-it-footnote": "^3.0.3",
         "markdown-it-implicit-figures": "^0.10.0",
         "markdown-it-imsize": "^2.0.1",
-        "markdown-it-ins": "^3.0.0",
-        "markdown-it-mark": "^3.0.0",
+        "markdown-it-ins": "^3.0.1",
+        "markdown-it-mark": "^3.0.1",
         "markdown-it-sub": "^1.0.0",
         "markdown-it-sup": "^1.0.0",
         "markdown-it-task-lists": "^2.1.1",
-        "yargs": "^16.1.1"
+        "yargs": "^16.2.0"
       }
     },
     "uc.micro": {
@@ -1397,9 +1417,9 @@
       "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA=="
     },
     "uglify-js": {
-      "version": "3.12.4",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.12.4.tgz",
-      "integrity": "sha512-L5i5jg/SHkEqzN18gQMTWsZk3KelRsfD1wUVNqtq0kzqWQqcJjyL8yc1o8hJgRrWqrAl2mUFbhfznEIoi7zi2A=="
+      "version": "3.14.1",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.14.1.tgz",
+      "integrity": "sha512-JhS3hmcVaXlp/xSo3PKY5R0JqKs5M3IV+exdLHW99qKvKivPO4Z8qbej6mte17SOPqAOVMjt/XGgWacnFSzM3g=="
     },
     "universalify": {
       "version": "0.1.2",
@@ -1466,9 +1486,9 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "y18n": {
-      "version": "5.0.5",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.5.tgz",
-      "integrity": "sha512-hsRUr4FFrvhhRH12wOdfs38Gy7k2FFzB9qgN9v3aLykRq0dRcdcpz5C9FxdS2NuhOrI/628b/KSTJ3rwHysYSg=="
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA=="
     },
     "yaml": {
       "version": "1.10.0",
@@ -1490,9 +1510,9 @@
       }
     },
     "yargs-parser": {
-      "version": "20.2.4",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
-      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA=="
+      "version": "20.2.9",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.9.tgz",
+      "integrity": "sha512-y11nGElTIV+CT3Zv9t7VKl+Q3hTQoT9a1Qzezhhl6Rp21gJ/IVTW7Z3y9EWXhuUBC2Shnf+DX0antecpAwSP8w=="
     },
     "yocto-queue": {
       "version": "0.1.0",
diff --git a/package.json b/package.json
index acd23bc..b67124a 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
   "dependencies": {
     "gh-pages": "^3.2.3",
     "husky": "^4.3.8",
-    "loppo": "^0.6.23",
-    "loppo-theme-wangdoc": "^0.5.2"
+    "loppo": "^0.6.24",
+    "loppo-theme-wangdoc": "^0.6.1"
   }
 }

From 53ae0a3d6b72d534ac54b7d1fe17ac5aff96ae1a Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 11 Sep 2021 19:43:39 +0800
Subject: [PATCH 077/123] docs(types/array): edit array hole

---
 docs/types/array.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/array.md b/docs/types/array.md
index 6f9d054..94944bf 100644
--- a/docs/types/array.md
+++ b/docs/types/array.md
@@ -303,7 +303,7 @@ var a = [1, , 1];
 a.length // 3
 ```
 
-上面代码表明，数组的空位不影响`length`属性。
+上面代码表明，数组的空位不影响`length`属性。虽然这个位置没有值，引擎依然认为这个位置是有效的。
 
 需要注意的是，如果最后一个元素后面有逗号，并不会产生空位。也就是说，有没有这个逗号，结果都是一样的。
 

From b924c7d95cd4888eee18e5d527b30edad034660d Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 19 Sep 2021 19:42:50 +0800
Subject: [PATCH 078/123] docs(bom/cookie): edit cookie

---
 docs/bom/cookie.md      | 28 ++++++++++++++++++++--------
 docs/bom/same-origin.md |  4 ++--
 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/docs/bom/cookie.md b/docs/bom/cookie.md
index 9c7f53b..a9ba47b 100644
--- a/docs/bom/cookie.md
+++ b/docs/bom/cookie.md
@@ -4,13 +4,15 @@
 
 Cookie 是服务器保存在浏览器的一小段文本信息，一般大小不能超过4KB。浏览器每次向服务器发出请求，就会自动附上这段信息。
 
-Cookie 主要保存状态信息，以下是一些主要用途。
+HTTP 协议不带有状态，有些请求需要区分状态，就通过 Cookie 附带字符串，让服务器返回不一样的回应。举例来说，用户登录以后，服务器往往会在网站上留下一个 Cookie，记录用户编号（比如`id=1234`），以后每次浏览器向服务器请求数据，就会带上这个字符串，服务器从而知道是谁在请求，应该回应什么内容。
 
-- 对话（session）管理：保存登录、购物车等需要记录的信息。
+Cookie 的目的就是区分用户，以及放置状态信息，它的使用场景主要如下。
+
+- 对话（session）管理：保存登录状态、购物车等需要记录的信息。
 - 个性化信息：保存用户的偏好，比如网页的字体大小、背景色等等。
 - 追踪用户：记录和分析用户行为。
 
-Cookie 不是一种理想的客户端储存机制。它的容量很小（4KB），缺乏数据操作接口，而且会影响性能。客户端储存应该使用 Web storage API 和 IndexedDB。只有那些每次请求都需要让服务器知道的信息，才应该放在 Cookie 里面。
+Cookie 不是一种理想的客户端存储机制。它的容量很小（4KB），缺乏数据操作接口，而且会影响性能。客户端存储建议使用 Web storage API 和 IndexedDB。只有那些每次请求都需要让服务器知道的信息，才应该放在 Cookie 里面。
 
 每个 Cookie 都有以下几方面的元数据。
 
@@ -20,7 +22,9 @@ Cookie 不是一种理想的客户端储存机制。它的容量很小（4KB）
 - 所属域名（默认为当前域名）
 - 生效的路径（默认为当前网址）
 
-举例来说，用户访问网址`www.example.com`，服务器在浏览器写入一个 Cookie。这个 Cookie 的所属域名为`www.example.com`，生效路径为根路径`/`。如果 Cookie 的生效路径设为`/forums`，那么这个 Cookie 只有在访问`www.example.com/forums`及其子路径时才有效。以后，浏览器访问某个路径之前，就会找出对该域名和路径有效，并且还没有到期的 Cookie，一起发送给服务器。
+举例来说，用户访问网址`www.example.com`，服务器在浏览器写入一个 Cookie。这个 Cookie 的所属域名为`www.example.com`，生效路径为根路径`/`。
+
+如果 Cookie 的生效路径设为`/forums`，那么这个 Cookie 只有在访问`www.example.com/forums`及其子路径时才有效。以后，浏览器访问某个路径之前，就会找出对该域名和路径有效，并且还没有到期的 Cookie，一起发送给服务器。
 
 用户可以设置浏览器不接受 Cookie，也可以设置不向服务器发送 Cookie。`window.navigator.cookieEnabled`属性返回一个布尔值，表示浏览器是否打开 Cookie 功能。
 
@@ -34,9 +38,17 @@ window.navigator.cookieEnabled // true
 document.cookie // "id=foo;key=bar"
 ```
 
-不同浏览器对 Cookie 数量和大小的限制，是不一样的。一般来说，单个域名设置的 Cookie 不应超过30个，每个 Cookie 的大小不能超过4KB。超过限制以后，Cookie 将被忽略，不会被设置。
+不同浏览器对 Cookie 数量和大小的限制，是不一样的。一般来说，单个域名设置的 Cookie 不应超过30个，每个 Cookie 的大小不能超过 4KB。超过限制以后，Cookie 将被忽略，不会被设置。
+
+Cookie 是按照域名区分的，`foo.com`只能读取自己放置的 Cookie，无法读取其他网站（比如`bar.com`）放置的 Cookie。一般情况下，一级域名也不能读取二级域名留下的 Cookie，比如`mydomain.com`不能读取`subdomain.mydomain.com`设置的 Cookie。但是有一个例外，设置 Cookie 的时候（不管是一级域名设置的，还是二级域名设置的），明确将`domain`属性设为一级域名，则这个域名下面的各级域名可以共享这个 Cookie。
+
+```http
+Set-Cookie: name=value; domain=mydomain.com
+```
+
+上面示例中，设置 Cookie 时，`domain`属性设为`mydomain.com`，那么各级的子域名和一级域名都可以读取这个 Cookie。
 
-浏览器的同源政策规定，两个网址只要域名相同，就可以共享 Cookie（参见《同源政策》一章）。注意，这里不要求协议相同。也就是说，`http://example.com`设置的 Cookie，可以被`https://example.com`读取。
+注意，区分 Cookie 时不考虑协议和端口。也就是说，`http://example.com`设置的 Cookie，可以被`https://example.com`或`http://example.com:8080`读取。
 
 ## Cookie 与 HTTP 协议
 
@@ -197,7 +209,7 @@ Set-Cookie:id=a3fWa;
 </form>
 ```
 
-用户一旦被诱骗发送这个表单，银行网站就会收到带有正确 Cookie 的请求。为了防止这种攻击，表单一般都带有一个随机 token，告诉服务器这是真实请求。
+用户一旦被诱骗发送这个表单，银行网站就会收到带有正确 Cookie 的请求。为了防止这种攻击，官网的表单一般都带有一个随机 token，官网服务器通过验证这个随机 token，确认是否为真实请求。
 
 ```html
 <form action="your-bank.com/transfer" method="POST">
@@ -206,7 +218,7 @@ Set-Cookie:id=a3fWa;
 </form>
 ```
 
-这种第三方网站引导发出的 Cookie，就称为第三方 Cookie。它除了用于 CSRF 攻击，还可以用于用户追踪。比如，Facebook 在第三方网站插入一张看不见的图片。
+这种第三方网站引导而附带发送的 Cookie，就称为第三方 Cookie。它除了用于 CSRF 攻击，还可以用于用户追踪。比如，Facebook 在第三方网站插入一张看不见的图片。
 
 ```html
 <img src="facebook.com" style="visibility:hidden;">
diff --git a/docs/bom/same-origin.md b/docs/bom/same-origin.md
index 553dc39..50577ce 100644
--- a/docs/bom/same-origin.md
+++ b/docs/bom/same-origin.md
@@ -89,10 +89,10 @@ var allCookie = document.cookie;
 
 注意，这种方法只适用于 Cookie 和 iframe 窗口，LocalStorage 和 IndexedDB 无法通过这种方法，规避同源政策，而要使用下文介绍 PostMessage API。
 
-另外，服务器也可以在设置 Cookie 的时候，指定 Cookie 的所属域名为一级域名，比如`.example.com`。
+另外，服务器也可以在设置 Cookie 的时候，指定 Cookie 的所属域名为一级域名，比如`example.com`。
 
 ```http
-Set-Cookie: key=value; domain=.example.com; path=/
+Set-Cookie: key=value; domain=example.com; path=/
 ```
 
 这样的话，二级域名和三级域名不用做任何设置，都可以读取这个 Cookie。

From cca8027372b16df27213976106d23e74a3ea3387 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Mon, 27 Sep 2021 13:00:21 +0800
Subject: [PATCH 079/123] docs(bom/navigator): edit text

---
 docs/bom/navigator.md |  6 +++---
 docs/dom/css.md       |  2 +-
 package-lock.json     | 30 +++++++++++++++---------------
 3 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/docs/bom/navigator.md b/docs/bom/navigator.md
index 0a92794..18476a7 100644
--- a/docs/bom/navigator.md
+++ b/docs/bom/navigator.md
@@ -6,7 +6,7 @@
 
 ### Navigator.userAgent
 
-`navigator.userAgent`属性返回浏览器的 User Agent 字符串，表示浏览器的厂商和版本信息。
+`navigator.userAgent`属性返回浏览器的 User Agent 字符串，表示用户设备信息，包含了浏览器的厂商、版本、操作系统等信息。
 
 下面是 Chrome 浏览器的`userAgent`。
 
@@ -22,7 +22,7 @@ navigator.userAgent
 ```javascript
 var ua = navigator.userAgent.toLowerCase();
 
-if (/mobi/i.test(ua)) {
+if (/mobi/.test(ua)) {
   // 手机浏览器
 } else {
   // 非手机浏览器
@@ -32,7 +32,7 @@ if (/mobi/i.test(ua)) {
 如果想要识别所有移动设备的浏览器，可以测试更多的特征字符串。
 
 ```javascript
-/mobi|android|touch|mini/i.test(ua)
+/mobi|android|touch|mini/.test(ua)
 ```
 
 ### Navigator.plugins
diff --git a/docs/dom/css.md b/docs/dom/css.md
index a29de76..5a1d39a 100644
--- a/docs/dom/css.md
+++ b/docs/dom/css.md
@@ -749,7 +749,7 @@ styleSheet.cssRules[0].conditionText
 
 ### 基本用法
 
-`window.matchMedia`方法用来将 CSS 的[`MediaQuery`](https://developer.mozilla.org/en-US/docs/DOM/Using_media_queries_from_code)条件语句，转换成一个 MediaQueryList 实例。
+`window.matchMedia()`方法用来将 CSS 的[`Media Query`](https://developer.mozilla.org/en-US/docs/DOM/Using_media_queries_from_code)条件语句，转换成一个 MediaQueryList 实例。
 
 ```javascript
 var mdl = window.matchMedia('(min-width: 400px)');
diff --git a/package-lock.json b/package-lock.json
index 9afdca7..8a03e78 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -92,9 +92,9 @@
       "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA=="
     },
     "ansi-regex": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
-      "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg=="
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ=="
     },
     "ansi-styles": {
       "version": "4.3.0",
@@ -139,9 +139,9 @@
       "integrity": "sha512-+q/t7Ekv1EDY2l6Gda6LLiX14rU9TV20Wa3ofeQmwPFZbOMo9DXrLbOjFaaclkXKWidIaopwAObQDqwWtGUjqg=="
     },
     "balanced-match": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="
     },
     "brace-expansion": {
       "version": "1.1.11",
@@ -460,9 +460,9 @@
       }
     },
     "find-cache-dir": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/find-cache-dir/-/find-cache-dir-3.3.1.tgz",
-      "integrity": "sha512-t2GDMt3oGC/v+BMwzmllWDuJF/xcDtE5j/fCGbqDD7OLuJkj0cfh1YSA5VKPvwMeLFLNDBkwOKZ2X85jGLVftQ==",
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/find-cache-dir/-/find-cache-dir-3.3.2.tgz",
+      "integrity": "sha512-wXZV5emFEjrridIgED11OoUKLxiYjAcqot/NJdAkOhlJ+vGzwhOAfcG5OX1jP+S0PcjEn8bdMJv+g2jwQ3Onig==",
       "requires": {
         "commondir": "^1.0.1",
         "make-dir": "^3.0.2",
@@ -561,9 +561,9 @@
       }
     },
     "graceful-fs": {
-      "version": "4.2.4",
-      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.4.tgz",
-      "integrity": "sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw=="
+      "version": "4.2.8",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.8.tgz",
+      "integrity": "sha512-qkIilPUYcNhJpd33n0GBXTB1MMPp14TxEsEs0pTrsSVucApsYzW5V+Q8Qxhik6KU3evy+qkAAowTByymK0avdg=="
     },
     "has-flag": {
       "version": "4.0.0",
@@ -1417,9 +1417,9 @@
       "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA=="
     },
     "uglify-js": {
-      "version": "3.14.1",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.14.1.tgz",
-      "integrity": "sha512-JhS3hmcVaXlp/xSo3PKY5R0JqKs5M3IV+exdLHW99qKvKivPO4Z8qbej6mte17SOPqAOVMjt/XGgWacnFSzM3g=="
+      "version": "3.14.2",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.14.2.tgz",
+      "integrity": "sha512-rtPMlmcO4agTUfz10CbgJ1k6UAoXM2gWb3GoMPPZB/+/Ackf8lNWk11K4rYi2D0apgoFRLtQOZhb+/iGNJq26A=="
     },
     "universalify": {
       "version": "0.1.2",

From 5fd3d345454d69762958a934369e906a0ebd3dbd Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Mon, 4 Oct 2021 23:43:13 +0800
Subject: [PATCH 080/123] docs(bom/cookie): edit domain property

---
 docs/bom/cookie.md | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/docs/bom/cookie.md b/docs/bom/cookie.md
index a9ba47b..80c542c 100644
--- a/docs/bom/cookie.md
+++ b/docs/bom/cookie.md
@@ -175,9 +175,19 @@ Set-Cookie: id=a3fWa; Expires=Wed, 21 Oct 2015 07:28:00 GMT;
 
 ### Domain，Path
 
-`Domain`属性指定浏览器发出 HTTP 请求时，哪些域名要附带这个 Cookie。如果没有指定该属性，浏览器会默认将其设为当前域名，这时子域名将不会附带这个 Cookie。比如，`example.com`不设置 Cookie 的`domain`属性，那么`sub.example.com`将不会附带这个 Cookie。如果指定了`domain`属性，那么子域名也会附带这个 Cookie。如果服务器指定的域名不属于当前域名，浏览器会拒绝这个 Cookie。
+`Domain`属性指定 Cookie 属于哪个域名，以后浏览器向服务器发送 HTTP 请求时，通过这个属性判断是否要附带某个 Cookie。
 
-`Path`属性指定浏览器发出 HTTP 请求时，哪些路径要附带这个 Cookie。只要浏览器发现，`Path`属性是 HTTP 请求路径的开头一部分，就会在头信息里面带上这个 Cookie。比如，`PATH`属性是`/`，那么请求`/docs`路径也会包含该 Cookie。当然，前提是域名必须一致。
+服务器设定 Cookie 时，如果没有指定 Domain 属性，浏览器会默认将其设为浏览器的当前域名。如果当前域名是一个 IP 地址，则不得设置 Domain 属性。
+
+如果指定 Domain 属性，需要遵守下面规则：Domain 属性只能是当前域名或者当前域名的上级域名，但设为上级域名时，不能设为顶级域名或公共域名。（顶级域名指的是 .com、.net 这样的域名，公共域名指的是开放给外部用户设置子域名的域名，比如 github.io。）如果不符合上面这条规则，浏览器会拒绝设置这个 Cookie。
+
+举例来说，当前域名为`x.y.z.com`，那么 Domain 属性可以设为`x.y.z.com`，或者`y.z.com`，或者`z.com`，但不能设为`foo.x.y.z.com`，或者`another.domain.com`。
+
+另一个例子是，当前域名为`wangdoc.github.io`，则 Domain 属性只能设为`wangdoc.github.io`，不能设为`github.io`，因为后者是一个公共域名。
+
+浏览器发送 Cookie 时，Domain 属性必须与当前域名一致，或者是当前域名的上级域名（公共域名除外）。比如，Domain 属性是`y.z.com`，那么适用于`y.z.com`、`x.y.z.com`、`foo.x.y.z.com`等域名。再比如，Domain 属性是公共域名`github.io`，那么只适用于`github.io`这个域名本身，不适用于它的子域名`wangdoc.github.io`。
+
+`Path`属性指定浏览器发出 HTTP 请求时，哪些路径要附带这个 Cookie。只要浏览器发现，`Path`属性是 HTTP 请求路径的开头一部分，就会在头信息里面带上这个 Cookie。比如，`Path`属性是`/`，那么请求`/docs`路径也会包含该 Cookie。当然，前提是 Domain 属性必须符合条件。
 
 ### Secure，HttpOnly
 

From 8ea87244214dcf50d3aec0b60920eaafabfb028d Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 28 Oct 2021 19:08:55 +0800
Subject: [PATCH 081/123] docs(dom/element): fixed #234

---
 docs/dom/element.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/dom/element.md b/docs/dom/element.md
index b569f31..2b5ea6d 100644
--- a/docs/dom/element.md
+++ b/docs/dom/element.md
@@ -89,7 +89,7 @@ document.documentElement.lang // "en"
 
 **（1）Element.hidden**
 
-`Element.hidden`属性返回一个布尔值，表示当前元素的`hidden`属性，用来控制当前元素是否可见。该属性可读写。
+`Element.hidden`属性返回一个布尔值，表示当前 HTML 元素的`hidden`属性的值。该属性可读写，用来控制当前元素是否可见。
 
 ```javascript
 var btn = document.getElementById('btn');
@@ -100,9 +100,9 @@ btn.addEventListener('click', function () {
 }, false);
 ```
 
-注意，该属性与 CSS 设置是互相独立的。CSS 对这个元素可见性的设置，`Element.hidden`并不能反映出来。也就是说，这个属性并不能用来判断当前元素的实际可见性。
+注意，该属性与 CSS 设置是互相独立的。CSS 对当前元素可见性的设置，`Element.hidden`并不能反映出来。也就是说，这个属性并不能用来判断当前元素的实际可见性。
 
-CSS 的设置高于`Element.hidden`。如果 CSS 指定了该元素不可见（`display: none`）或可见（`display: hidden`），那么`Element.hidden`并不能改变该元素实际的可见性。换言之，这个属性只在 CSS 没有明确设定当前元素的可见性时才有效。
+CSS 设置的优先级高于`Element.hidden`。如果 CSS 指定了该元素不可见（`display: none`）或可见（`visibility: visible`），那么`Element.hidden`并不能改变该元素实际的可见性。换言之，这个属性只在 CSS 没有明确设定当前元素的可见性时才有效。
 
 **（2）Element.contentEditable，Element.isContentEditable**
 

From c426ae28ced38a3e56fc18ec3215bfaf266ea1df Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Fri, 29 Oct 2021 08:05:50 +0800
Subject: [PATCH 082/123] docs(dom/nodelist): edit
 HTMLCollection.prototype.namedItem()

---
 docs/dom/nodelist.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/docs/dom/nodelist.md b/docs/dom/nodelist.md
index f5c9457..bda3939 100644
--- a/docs/dom/nodelist.md
+++ b/docs/dom/nodelist.md
@@ -179,7 +179,7 @@ var img0 = c.item(0);
 
 ### HTMLCollection.prototype.namedItem()
 
-`namedItem`方法的参数是一个字符串，表示`id`属性或`name`属性的值，返回对应的元素节点。如果没有对应的节点，则返回`null`。
+`namedItem`方法的参数是一个字符串，表示`id`属性或`name`属性的值，返回当前集合中对应的元素节点。如果没有对应的节点，则返回`null`。
 
 ```javascript
 // HTML 代码如下
@@ -188,3 +188,6 @@ var img0 = c.item(0);
 var pic = document.getElementById('pic');
 document.images.namedItem('pic') === pic // true
 ```
+
+`Collection.namedItem('value')`等同于`Collection['value']`。
+

From 074e7f591a70b1110a22a120c9f8bf6a74788001 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 5 Feb 2022 09:04:13 +0800
Subject: [PATCH 083/123] docs(stdlib/date): fix #237

---
 docs/stdlib/date.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/stdlib/date.md b/docs/stdlib/date.md
index 4edbaeb..af7ad94 100644
--- a/docs/stdlib/date.md
+++ b/docs/stdlib/date.md
@@ -361,7 +361,7 @@ d.toLocaleTimeString('zh-CN') // "上午12:00:00"
 - `weekday`：可能的值为`long`、`short`、`narrow`。
 - `day`、`hour`、`minute`、`second`：可能的值为`numeric`、`2-digit`。
 - `timeZone`：可能的值为 IANA 的时区数据库。
-- `timeZooneName`：可能的值为`long`、`short`。
+- `timeZoneName`：可能的值为`long`、`short`。
 - `hour12`：24小时周期还是12小时周期，可能的值为`true`、`false`。
 
 下面是用法实例。

From f901426d946ba4ced8f3b0ff70bc73d01e27c382 Mon Sep 17 00:00:00 2001
From: Jim Gao <yidajiabei@163.com>
Date: Tue, 1 Mar 2022 13:14:29 +0800
Subject: [PATCH 084/123] docs: fix url (#239)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* fix url

* fix url

* docs(basic/grammar): update url

Update 2013-06-22: “Basic JavaScript: an introduction to the language” is an improved longer version of this post

* docs(types/number): fix url

* docs(types/object): remove extra word

* docs(types/function): fix url

* docs(operators/bit): update url

* docs(features/style): fix url

* docs(stdlib/date): update url

* docs(oop/prototype): update url

* docs(async/promise): fix url

* docs(bom/engine): update url
---
 docs/async/promise.md  | 2 +-
 docs/basic/grammar.md  | 2 +-
 docs/basic/history.md  | 6 +++---
 docs/bom/engine.md     | 2 +-
 docs/features/style.md | 2 +-
 docs/oop/prototype.md  | 2 +-
 docs/operators/bit.md  | 2 +-
 docs/stdlib/date.md    | 4 ++--
 docs/types/function.md | 2 +-
 docs/types/number.md   | 2 +-
 docs/types/object.md   | 2 +-
 11 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/docs/async/promise.md b/docs/async/promise.md
index 68b5c07..cb629d7 100644
--- a/docs/async/promise.md
+++ b/docs/async/promise.md
@@ -274,7 +274,7 @@ console.log(3);
 
 ## 参考链接
 
-- Sebastian Porto, [Asynchronous JS: Callbacks, Listeners, Control Flow Libs and Promises](http://sporto.github.com/blog/2012/12/09/callbacks-listeners-promises/)
+- Sebastian Porto, [Asynchronous JS: Callbacks, Listeners, Control Flow Libs and Promises](https://sporto.github.io/blog/2012/12/09/callbacks-listeners-promises/)
 - Rhys Brett-Bowen, [Promises/A+ - understanding the spec through implementation](http://modernjavascript.blogspot.com/2013/08/promisesa-understanding-by-doing.html)
 - Matt Podwysocki, Amanda Silver, [Asynchronous Programming in JavaScript with “Promises”](http://blogs.msdn.com/b/ie/archive/2011/09/11/asynchronous-programming-in-javascript-with-promises.aspx)
 - Marc Harter, [Promise A+ Implementation](https://gist.github.com//wavded/5692344)
diff --git a/docs/basic/grammar.md b/docs/basic/grammar.md
index 1611427..b1ebde1 100644
--- a/docs/basic/grammar.md
+++ b/docs/basic/grammar.md
@@ -727,4 +727,4 @@ top:
 
 ## 参考链接
 
-- Axel Rauschmayer, [A quick overview of JavaScript](http://www.2ality.com/2011/10/javascript-overview.html)
+- Axel Rauschmayer, [Basic JavaScript for the impatient programmer](https://2ality.com/2013/06/basic-javascript.html)
diff --git a/docs/basic/history.md b/docs/basic/history.md
index 0c03d6d..f5c266b 100644
--- a/docs/basic/history.md
+++ b/docs/basic/history.md
@@ -181,7 +181,7 @@ JavaScript 伴随着互联网的发展一起发展。互联网周边技术的快
 
 ## 参考链接
 
-- Axel Rauschmayer, [The Past, Present, and Future of JavaScript](http://oreilly.com/javascript/radarreports/past-present-future-javascript.csp)
+- Axel Rauschmayer, [The Past, Present, and Future of JavaScript](https://www.oreilly.com/library/view/the-past-present/9781449343545/)
 - John Dalziel, [The race for speed part 4: The future for JavaScript](http://creativejs.com/2013/06/the-race-for-speed-part-4-the-future-for-javascript/)
-- Axel Rauschmayer, [Basic JavaScript for the impatient programmer](http://www.2ality.com/2013/06/basic-javascript.html)
-- resin.io, [Happy 18th Birthday JavaScript! A look at an unlikely past and bright future](http://resin.io/happy-18th-birthday-javascript/)
+- Axel Rauschmayer, [Basic JavaScript for the impatient programmer](https://www.2ality.com/2013/06/basic-javascript.html)
+- balena.io, [Happy 18th Birthday JavaScript! A look at an unlikely past and bright future](https://www.balena.io/blog/happy-18th-birthday-javascript/)
diff --git a/docs/bom/engine.md b/docs/bom/engine.md
index 86e7f53..8c0761e 100644
--- a/docs/bom/engine.md
+++ b/docs/bom/engine.md
@@ -436,4 +436,4 @@ JavaScript 是一种解释型语言，也就是说，它不需要编译，由解
 - Axel Rauschmayer, [ECMAScript 6 promises (1/2): foundations](http://www.2ality.com/2014/09/es6-promises-foundations.html)
 - Daniel Imms, [async vs defer attributes](http://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html)
 - Craig Buckler, [Load Non-blocking JavaScript with HTML5 Async and Defer](http://www.sitepoint.com/non-blocking-async-defer/)
-- Domenico De Felice, [How browsers work](http://domenicodefelice.blogspot.sg/2015/08/how-browsers-work.html?t=2)
+- Domenico De Felice, [How browsers work](https://domenicodefelice.blogspot.com/2015/08/how-browsers-work.html)
diff --git a/docs/features/style.md b/docs/features/style.md
index 8947aca..0ea77e1 100644
--- a/docs/features/style.md
+++ b/docs/features/style.md
@@ -486,7 +486,7 @@ function doAction(action) {
 
 ## 参考链接
 
-- Eric Elliott, Programming JavaScript Applications, [Chapter 2. JavaScript Style Guide](http://chimera.labs.oreilly.com/books/1234000000262/ch02.html), O'Reilly, 2013
+- Eric Elliott, Programming JavaScript Applications, [Chapter 2. JavaScript Style Guide](https://www.oreilly.com/library/view/programming-javascript-applications/9781491950289/), O'Reilly, 2014
 - Axel Rauschmayer, [A meta style guide for JavaScript](http://www.2ality.com/2013/07/meta-style-guide.html)
 - Axel Rauschmayer, [Automatic semicolon insertion in JavaScript](http://www.2ality.com/2011/05/semicolon-insertion.html)
 - Rod Vagg, [JavaScript and Semicolons](http://dailyjs.com/2012/04/19/semicolons/)
diff --git a/docs/oop/prototype.md b/docs/oop/prototype.md
index 76077e2..d1ae8df 100644
--- a/docs/oop/prototype.md
+++ b/docs/oop/prototype.md
@@ -637,4 +637,4 @@ var module1 = (function ($, YAHOO) {
 
 ## 参考链接
 
-- [JavaScript Modules: A Beginner’s Guide](https://medium.freecodecamp.com/javascript-modules-a-beginner-s-guide-783f7d7a5fcc), by Preethi Kasireddy
+- [JavaScript Modules: A Beginner’s Guide](https://www.freecodecamp.org/news/javascript-modules-a-beginner-s-guide-783f7d7a5fcc), by Preethi Kasireddy
diff --git a/docs/operators/bit.md b/docs/operators/bit.md
index edbb8b4..3c86e3d 100644
--- a/docs/operators/bit.md
+++ b/docs/operators/bit.md
@@ -353,6 +353,6 @@ flags = ~flags;
 
 ## 参考链接
 
-- Michal Budzynski, [JavaScript: The less known parts. Bitwise Operators](http://michalbe.blogspot.co.uk/2013/03/javascript-less-known-parts-bitwise.html)
+- Michal Budzynski, [JavaScript: The less known parts. Bitwise Operators](https://michalbe.blogspot.com/2013/03/javascript-less-known-parts-bitwise.html)
 - Axel Rauschmayer, [Basic JavaScript for the impatient programmer](http://www.2ality.com/2013/06/basic-javascript.html)
 - Mozilla Developer Network, [Bitwise Operators](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators)
diff --git a/docs/stdlib/date.md b/docs/stdlib/date.md
index af7ad94..2b0326e 100644
--- a/docs/stdlib/date.md
+++ b/docs/stdlib/date.md
@@ -545,5 +545,5 @@ d // Sun Jan 06 2013 06:00:00 GMT+0800 (CST)
 
 ## 参考链接
 
-- Rakhitha Nimesh，[Getting Started with the Date Object](http://jspro.com/raw-javascript/beginners-guide-to-javascript-date-and-time/)
-- Ilya Kantor, [Date/Time functions](http://javascript.info/tutorial/datetime-functions)
+- Rakhitha Nimesh，[Getting Started with the Date Object](https://www.sitepoint.com/beginners-guide-to-javascript-date-and-time/)
+- Ilya Kantor, [Date/Time functions](https://javascript.info/date)
diff --git a/docs/types/function.md b/docs/types/function.md
index d8e649e..ef8625f 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -993,7 +993,7 @@ window.eval('...')
 
 - Ben Alman, [Immediately-Invoked Function Expression (IIFE)](http://benalman.com/news/2010/11/immediately-invoked-function-expression/)
 - Mark Daggett, [Functions Explained](http://markdaggett.com/blog/2013/02/15/functions-explained/)
-- Juriy Zaytsev, [Named function expressions demystified](http://kangax.github.com/nfe/)
+- Juriy Zaytsev, [Named function expressions demystified](http://kangax.github.io/nfe/)
 - Marco Rogers polotek, [What is the arguments object?](http://docs.nodejitsu.com/articles/javascript-conventions/what-is-the-arguments-object)
 - Juriy Zaytsev, [Global eval. What are the options?](http://perfectionkills.com/global-eval-what-are-the-options/)
 - Axel Rauschmayer, [Evaluating JavaScript code via eval() and new Function()](http://www.2ality.com/2014/01/eval.html)
diff --git a/docs/types/number.md b/docs/types/number.md
index af8954e..64f0592 100644
--- a/docs/types/number.md
+++ b/docs/types/number.md
@@ -651,4 +651,4 @@ isFinite(-1) // true
 ## 参考链接
 
 - Dr. Axel Rauschmayer, [How numbers are encoded in JavaScript](http://www.2ality.com/2012/04/number-encoding.html)
-- Humphry, [JavaScript 中 Number 的一些表示上/下限](http://blog.segmentfault.com/humphry/1190000000407658)
+- Humphry, [JavaScript 中 Number 的一些表示上/下限](https://segmentfault.com/a/1190000000407658)
diff --git a/docs/types/object.md b/docs/types/object.md
index 9e50984..3ff539c 100644
--- a/docs/types/object.md
+++ b/docs/types/object.md
@@ -497,5 +497,5 @@ console.log(temp.p1 + temp.p2);
 
 - Dr. Axel Rauschmayer，[Object properties in JavaScript](http://www.2ality.com/2012/10/javascript-properties.html)
 - Lakshan Perera, [Revisiting JavaScript Objects](http://www.laktek.com/2012/12/29/revisiting-javascript-objects/)
-- Angus Croll, [The Secret Life of JavaScript Primitives](http://javascriptweblog.wordpress.com/2010/09/27/the-secret-life-of-javascript-primitives/)i
+- Angus Croll, [The Secret Life of JavaScript Primitives](http://javascriptweblog.wordpress.com/2010/09/27/the-secret-life-of-javascript-primitives/)
 - Dr. Axel Rauschmayer, [JavaScript’s with statement and why it’s deprecated](http://www.2ality.com/2011/06/with-statement.html)

From bf18144c97bae1662f72cc02ecbbf7d75093a076 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Tue, 1 Mar 2022 13:41:56 +0800
Subject: [PATCH 085/123] docs(types/function): fix #239 broken reference link

---
 docs/types/function.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index ef8625f..76dcbfb 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -992,7 +992,7 @@ window.eval('...')
 ## 参考链接
 
 - Ben Alman, [Immediately-Invoked Function Expression (IIFE)](http://benalman.com/news/2010/11/immediately-invoked-function-expression/)
-- Mark Daggett, [Functions Explained](http://markdaggett.com/blog/2013/02/15/functions-explained/)
+- Mark Daggett, [Functions Explained](https://web.archive.org/web/20160911170816/http://markdaggett.com/blog/2013/02/15/functions-explained/)
 - Juriy Zaytsev, [Named function expressions demystified](http://kangax.github.io/nfe/)
 - Marco Rogers polotek, [What is the arguments object?](http://docs.nodejitsu.com/articles/javascript-conventions/what-is-the-arguments-object)
 - Juriy Zaytsev, [Global eval. What are the options?](http://perfectionkills.com/global-eval-what-are-the-options/)

From b5ccb913171f73f18b8743701d37a6e1e53df0d1 Mon Sep 17 00:00:00 2001
From: hehe1111 <2908749709@qq.com>
Date: Tue, 5 Apr 2022 20:50:45 +0800
Subject: [PATCH 086/123] =?UTF-8?q?=E8=B7=9F=20160=20=E8=A1=8C=E7=9A=84=20?=
 =?UTF-8?q?Content-Type=20=E9=87=8D=E5=A4=8D=E4=BA=86=20(#241)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/bom/cors.md | 1 -
 1 file changed, 1 deletion(-)

diff --git a/docs/bom/cors.md b/docs/bom/cors.md
index 368ea0c..23dfac9 100644
--- a/docs/bom/cors.md
+++ b/docs/bom/cors.md
@@ -162,7 +162,6 @@ Content-Encoding: gzip
 Content-Length: 0
 Keep-Alive: timeout=2, max=100
 Connection: Keep-Alive
-Content-Type: text/plain
 ```
 
 上面的 HTTP 回应中，关键的是`Access-Control-Allow-Origin`字段，表示`http://api.bob.com`可以请求数据。该字段也可以设为星号，表示同意任意跨源请求。

From c0737828d443c2fb939054417c0a22a7505f0c75 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 7 Apr 2022 13:47:00 +0800
Subject: [PATCH 087/123] docs(elements/input): edit valueAsNumber

---
 docs/elements/input.md |   13 +-
 package-lock.json      | 1523 ----------------------------------------
 2 files changed, 12 insertions(+), 1524 deletions(-)
 delete mode 100644 package-lock.json

diff --git a/docs/elements/input.md b/docs/elements/input.md
index 9a04e0e..fce544a 100644
--- a/docs/elements/input.md
+++ b/docs/elements/input.md
@@ -75,7 +75,18 @@
 - `labels`：返回一个`NodeList`实例，代表绑定当前`<input>`节点的`<label>`元素。该属性只读。
 - `step`：字符串，表示在`min`属性到`max`属性之间，每次递增或递减时的数值或时间。
 - `valueAsDate`：`Date`实例，一旦设置，该`<input>`元素的值会被解释为指定的日期。如果无法解析该属性的值，`<input>`节点的值将是`null`。
-- `valueAsNumber`：浮点数，当前`<input>`元素的值会被解析为这个数值。
+- `valueAsNumber`：浮点数，当前`<input>`元素的值会被解析为这个数值。如果输入框为空，该属性返回`NaN`。
+
+下面是`valueAsNumber`属性的例子。
+
+```javascript
+/* HTML 代码如下
+   <input type="number" value="1.234" />
+*/
+
+input.value // "1.234"
+input.valueAsNumber // 1.234
+```
 
 ## HTMLInputElement 的实例方法
 
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 8a03e78..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,1523 +0,0 @@
-{
-  "name": "javascript-tutorial",
-  "version": "0.0.1",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "@babel/code-frame": {
-      "version": "7.12.11",
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From ff1663163febe084ad31008f05a6c7b0e3bbaa98 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 10 Apr 2022 12:33:28 +0800
Subject: [PATCH 088/123] docs(bom/xmlhttprequest): edit Navigator.sendBeacon()

---
 docs/bom/xmlhttprequest.md | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/docs/bom/xmlhttprequest.md b/docs/bom/xmlhttprequest.md
index 8855064..66f662c 100644
--- a/docs/bom/xmlhttprequest.md
+++ b/docs/bom/xmlhttprequest.md
@@ -743,7 +743,7 @@ window.addEventListener('unload', function(event) {
 
 上面代码中，强制执行了一次双重循环，拖长了`unload`事件的执行时间，导致异步 AJAX 能够发送成功。
 
-类似的还可以使用`setTimeout`。下面是追踪用户点击的例子。
+类似的还可以使用`setTimeout()`。下面是追踪用户点击的例子。
 
 ```javascript
 // HTML 代码如下
@@ -768,7 +768,7 @@ theLink.addEventListener('click', function (event) {
 });
 ```
 
-上面代码使用`setTimeout`，拖延了350毫秒，才让页面跳转，因此使得异步 AJAX 有时间发出。
+上面代码使用`setTimeout()`，拖延了350毫秒，才让页面跳转，因此使得异步 AJAX 有时间发出。
 
 这些做法的共同问题是，卸载的时间被硬生生拖长了，后面页面的加载被推迟了，用户体验不好。
 
@@ -778,11 +778,13 @@ theLink.addEventListener('click', function (event) {
 window.addEventListener('unload', logData, false);
 
 function logData() {
-  navigator.sendBeacon('/log', analyticsData);
+  navigator.sendBeacon('/log', JSON.stringify({
+    some: "data"
+  }));
 }
 ```
 
-`Navigator.sendBeacon`方法接受两个参数，第一个参数是目标服务器的 URL，第二个参数是所要发送的数据（可选），可以是任意类型（字符串、表单对象、二进制对象等等）。
+`Navigator.sendBeacon()`方法接受两个参数，第一个参数是目标服务器的 URL，第二个参数是所要发送的数据（可选），可以是任意类型（字符串、表单对象、二进制对象等等）。
 
 ```javascript
 navigator.sendBeacon(url, data)
@@ -806,3 +808,16 @@ function analytics(state) {
   navigator.sendBeacon(URL, data);
 }
 ```
+
+该方法不允许自定义 HTTP 标头，为了以“application/json”的形式发送数据，可以使用 Blob 对象。
+
+```javascript
+const blob = new Blob(
+  [ JSON.stringify({ some: "data" }) ],
+  { type: 'application/json; charset=UTF-8' }
+);
+navigator.sendBeacon('/log', blob));
+```
+
+这个方法的优先级较低，不会占用页面资源。一般是在浏览器空闲的时候，才会发送。
+

From 37de2eb20d6b69eacce9930f796ed82aab47df5e Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 18 May 2022 13:42:03 +0800
Subject: [PATCH 089/123] docs(types/function): fix #245

---
 docs/types/function.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/function.md b/docs/types/function.md
index 76dcbfb..751bca5 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -1,6 +1,6 @@
 # 函数
 
-函数是一段可以反复调用的代码块。函数还能接受输入的参数，不同的参数会返回不同的值。
+函数是一段可以反复调用的代码块。函数还能接受输入的参数，不同的参数有唯一对应的返回值。
 
 ## 概述
 

From ad7cd2ba990f0d18aa6fa08a310f1c64d04535cd Mon Sep 17 00:00:00 2001
From: yuri <yuu2lee4@qq.com>
Date: Tue, 7 Jun 2022 15:04:25 +0800
Subject: [PATCH 090/123] Update number.md (#247)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

parseFloat参数不是字符串会先进行隐式类型转换
---
 docs/types/number.md | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/docs/types/number.md b/docs/types/number.md
index 64f0592..b61dc6a 100644
--- a/docs/types/number.md
+++ b/docs/types/number.md
@@ -552,7 +552,15 @@ parseFloat('3.14more non-digit characters') // 3.14
 parseFloat('\t\v\r12.34\n ') // 12.34
 ```
 
-如果参数不是字符串，或者字符串的第一个字符不能转化为浮点数，则返回`NaN`。
+如果参数不是字符串，则会先转为字符串再转换。
+
+```javascript
+parseFloat([1.23]) // 1.23
+// 等同于
+parseFloat(String([1.23])) // 1.23
+```
+
+如果字符串的第一个字符不能转化为浮点数，则返回`NaN`。
 
 ```javascript
 parseFloat([]) // NaN

From 87ce3dc5adee2b3caa7b9ec798957f0e98f2b697 Mon Sep 17 00:00:00 2001
From: IKKI2000 <ikki2002@qq.com>
Date: Thu, 30 Jun 2022 13:13:38 +0800
Subject: [PATCH 091/123] Update regexp.md (#249)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

补全 3.1 示例代码返回值~
---
 docs/stdlib/regexp.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/stdlib/regexp.md b/docs/stdlib/regexp.md
index 8e306e0..cc0f002 100644
--- a/docs/stdlib/regexp.md
+++ b/docs/stdlib/regexp.md
@@ -104,7 +104,7 @@ r.lastIndex = 4;
 r.test(s) // false
 
 r.lastIndex // 0
-r.test(s)
+r.test(s) // true
 ```
 
 上面代码指定从字符串的第五个位置开始搜索，这个位置为空，所以返回`false`。同时，`lastIndex`属性重置为`0`，所以第二次执行`r.test(s)`会返回`true`。

From 91b5581574ee490bd0cbfde91aa1d06db42ba8d7 Mon Sep 17 00:00:00 2001
From: IKKI2000 <ikki2002@qq.com>
Date: Thu, 30 Jun 2022 13:14:56 +0800
Subject: [PATCH 092/123] Update date.md (#250)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

补全 5.4 设置毫秒方法的参数~
---
 docs/stdlib/date.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/stdlib/date.md b/docs/stdlib/date.md
index 2b0326e..a44b2c8 100644
--- a/docs/stdlib/date.md
+++ b/docs/stdlib/date.md
@@ -479,7 +479,7 @@ d.getUTCDate() // 5
 - `setDate(date)`：设置实例对象对应的每个月的几号（1-31），返回改变后毫秒时间戳。
 - `setFullYear(year [, month, date])`：设置四位年份。
 - `setHours(hour [, min, sec, ms])`：设置小时（0-23）。
-- `setMilliseconds()`：设置毫秒（0-999）。
+- `setMilliseconds(ms)`：设置毫秒（0-999）。
 - `setMinutes(min [, sec, ms])`：设置分钟（0-59）。
 - `setMonth(month [, date])`：设置月份（0-11）。
 - `setSeconds(sec [, ms])`：设置秒（0-59）。

From 6eeecbf37e054517b6f4f0d23fdb597c6ff7f5e5 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 16 Nov 2022 13:17:54 +0800
Subject: [PATCH 093/123] docs(basic/grammar): fix typo #253

---
 docs/basic/grammar.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/basic/grammar.md b/docs/basic/grammar.md
index b1ebde1..b0dea02 100644
--- a/docs/basic/grammar.md
+++ b/docs/basic/grammar.md
@@ -485,7 +485,7 @@ var msg = '数字' + n + '是' + (n % 2 === 0 ? '偶数' : '奇数');
 
 ### while 循环
 
-`While`语句包括一个循环条件和一段代码块，只要条件为真，就不断循环执行代码块。
+`while`语句包括一个循环条件和一段代码块，只要条件为真，就不断循环执行代码块。
 
 ```javascript
 while (条件)

From eeb6d159235230468c5e05053fb630406d8bb1f5 Mon Sep 17 00:00:00 2001
From: Hencky <40154205+Hencky@users.noreply.github.com>
Date: Wed, 28 Dec 2022 22:43:11 +0800
Subject: [PATCH 094/123] =?UTF-8?q?fix:=20=E8=BF=90=E7=AE=97=E7=AC=A6/?=
 =?UTF-8?q?=E6=AF=94=E8=BE=83=E8=BF=90=E7=AE=97=E7=AC=A6=20=E6=96=87?=
 =?UTF-8?q?=E6=A1=88=E9=94=99=E8=AF=AF=20(#254)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/operators/comparison.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/operators/comparison.md b/docs/operators/comparison.md
index 3f34eca..1355039 100644
--- a/docs/operators/comparison.md
+++ b/docs/operators/comparison.md
@@ -99,7 +99,7 @@ x > '11' // true
 
 x.valueOf = function () { return '1' };
 x > '11' // false
-// 等同于 [2].valueOf() > '11'
+// 等同于 (function () { return '1' })() > '11'
 // 即 '1' > '11'
 ```
 
@@ -115,7 +115,7 @@ x > '11' // false
 // 即 '2' > '11'
 
 { x: 2 } >= { x: 1 } // true
-// 等同于 { x: 2 }.valueOf().toString() >= { x: 1 }.valueOf().toString()
+// 等同于 ({ x: 2 }).valueOf().toString() >= ({ x: 1 }).valueOf().toString()
 // 即 '[object Object]' >= '[object Object]'
 ```
 

From 2e3f11bdb95836fbff1c897995e0b06b4d3aab30 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 2 Feb 2023 17:43:53 +0800
Subject: [PATCH 095/123] docs(operator/comparison): fix text

---
 docs/operators/comparison.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/operators/comparison.md b/docs/operators/comparison.md
index 1355039..002254a 100644
--- a/docs/operators/comparison.md
+++ b/docs/operators/comparison.md
@@ -114,7 +114,7 @@ x > '11' // false
 // 等同于 [2].valueOf().toString() > [11].valueOf().toString()
 // 即 '2' > '11'
 
-{ x: 2 } >= { x: 1 } // true
+({ x: 2 }) >= ({ x: 1 }) // true
 // 等同于 ({ x: 2 }).valueOf().toString() >= ({ x: 1 }).valueOf().toString()
 // 即 '[object Object]' >= '[object Object]'
 ```

From 6dc6fb5e4a2a2bf2c67fed65abe6099d276d57da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=AD=9F=E7=A5=A5=5F=E6=88=90=E9=83=BD?=
 <1334196450@qq.com>
Date: Sat, 4 Feb 2023 10:34:02 +0800
Subject: [PATCH 096/123] Update cookie.md (#255)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

cookie中domain的值中是不能加*号的
---
 docs/bom/cookie.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/cookie.md b/docs/bom/cookie.md
index 80c542c..a6b49a6 100644
--- a/docs/bom/cookie.md
+++ b/docs/bom/cookie.md
@@ -352,7 +352,7 @@ document.cookie = "foo=bar; expires=Fri, 31 Dec 2020 23:59:59 GMT";
 document.cookie = 'fontSize=14; '
   + 'expires=' + someDate.toGMTString() + '; '
   + 'path=/subdirectory; '
-  + 'domain=*.example.com';
+  + 'domain=.example.com';
 ```
 
 Cookie 的属性一旦设置完成，就没有办法读取这些属性的值。

From 133c2d45e787f0e7425a0e44f2c6c469d08c839a Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 4 Feb 2023 10:39:47 +0800
Subject: [PATCH 097/123] docs(bom/cookie): edit set-cookie's domain property

---
 docs/bom/cookie.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/docs/bom/cookie.md b/docs/bom/cookie.md
index a6b49a6..e0ae045 100644
--- a/docs/bom/cookie.md
+++ b/docs/bom/cookie.md
@@ -342,7 +342,7 @@ document.cookie = "foo=bar; expires=Fri, 31 Dec 2020 23:59:59 GMT";
 各个属性的写入注意点如下。
 
 - `path`属性必须为绝对路径，默认为当前路径。
-- `domain`属性值必须是当前发送 Cookie 的域名的一部分。比如，当前域名是`example.com`，就不能将其设为`foo.com`。该属性默认为当前的一级域名（不含二级域名）。
+- `domain`属性值必须是当前发送 Cookie 的域名的一部分。比如，当前域名是`example.com`，就不能将其设为`foo.com`。该属性默认为当前的一级域名（不含二级域名）。如果显式设置该属性，则该域名的任意子域名也可以读取 Cookie。
 - `max-age`属性的值为秒数。
 - `expires`属性的值为 UTC 格式，可以使用`Date.prototype.toUTCString()`进行日期格式转换。
 
@@ -352,9 +352,11 @@ document.cookie = "foo=bar; expires=Fri, 31 Dec 2020 23:59:59 GMT";
 document.cookie = 'fontSize=14; '
   + 'expires=' + someDate.toGMTString() + '; '
   + 'path=/subdirectory; '
-  + 'domain=.example.com';
+  + 'domain=example.com';
 ```
 
+注意，上面的`domain`属性，以前的写法是`.example.com`，表示子域名也可以读取该 Cookie，新的写法可以省略前面的点。
+
 Cookie 的属性一旦设置完成，就没有办法读取这些属性的值。
 
 删除一个现存 Cookie 的唯一方法，是设置它的`expires`属性为一个过去的日期。

From 482a5170651b5efc1f5d9e408cb4cc138056d082 Mon Sep 17 00:00:00 2001
From: fw_qaq <fwqaaq@gmail.com>
Date: Sun, 12 Feb 2023 23:13:20 +0800
Subject: [PATCH 098/123] fix translation about cross-origin (#256)

---
 docs/bom/cors.md | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/docs/bom/cors.md b/docs/bom/cors.md
index 23dfac9..566e1f0 100644
--- a/docs/bom/cors.md
+++ b/docs/bom/cors.md
@@ -1,12 +1,12 @@
 # CORS 通信
 
-CORS 是一个 W3C 标准，全称是“跨域资源共享”（Cross-origin resource sharing）。它允许浏览器向跨域的服务器，发出`XMLHttpRequest`请求，从而克服了 AJAX 只能同源使用的限制。
+CORS 是一个 W3C 标准，全称是“跨源资源共享”（Cross-origin resource sharing），或者通俗地称为“跨域资源共享”。它允许浏览器向跨源的服务器，发出`XMLHttpRequest`请求，从而克服了 AJAX 只能同源使用的限制。
 
 ## 简介
 
 CORS 需要浏览器和服务器同时支持。目前，所有浏览器都支持该功能。
 
-整个 CORS 通信过程，都是浏览器自动完成，不需要用户参与。对于开发者来说，CORS 通信与普通的 AJAX 通信没有差别，代码完全一样。浏览器一旦发现 AJAX 请求跨域，就会自动添加一些附加的头信息，有时还会多出一次附加的请求，但用户不会有感知。因此，实现 CORS 通信的关键是服务器。只要服务器实现了 CORS 接口，就可以跨域通信。
+整个 CORS 通信过程，都是浏览器自动完成，不需要用户参与。对于开发者来说，CORS 通信与普通的 AJAX 通信没有差别，代码完全一样。浏览器一旦发现 AJAX 请求跨源，就会自动添加一些附加的头信息，有时还会多出一次附加的请求，但用户不会有感知。因此，实现 CORS 通信的关键是服务器。只要服务器实现了 CORS 接口，就可以跨源通信。
 
 ## 两种请求
 
@@ -30,7 +30,7 @@ CORS 请求分成两类：简单请求（simple request）和非简单请求（n
 
 凡是不同时满足上面两个条件，就属于非简单请求。一句话，简单请求就是简单的 HTTP 方法与简单的 HTTP 头信息的结合。
 
-这样划分的原因是，表单在历史上一直可以跨域发出请求。简单请求就是表单请求，浏览器沿袭了传统的处理方式，不把行为复杂化，否则开发者可能转而使用表单，规避 CORS 的限制。对于非简单请求，浏览器会采用新的处理方式。
+这样划分的原因是，表单在历史上一直可以跨源发出请求。简单请求就是表单请求，浏览器沿袭了传统的处理方式，不把行为复杂化，否则开发者可能转而使用表单，规避 CORS 的限制。对于非简单请求，浏览器会采用新的处理方式。
 
 ## 简单请求
 
@@ -38,7 +38,7 @@ CORS 请求分成两类：简单请求（simple request）和非简单请求（n
 
 对于简单请求，浏览器直接发出 CORS 请求。具体来说，就是在头信息之中，增加一个`Origin`字段。
 
-下面是一个例子，浏览器发现这次跨域 AJAX 请求是简单请求，就自动在头信息之中，添加一个`Origin`字段。
+下面是一个例子，浏览器发现这次跨源 AJAX 请求是简单请求，就自动在头信息之中，添加一个`Origin`字段。
 
 ```http
 GET /cors HTTP/1.1
@@ -99,7 +99,7 @@ xhr.withCredentials = true;
 xhr.withCredentials = false;
 ```
 
-需要注意的是，如果服务器要求浏览器发送 Cookie，`Access-Control-Allow-Origin`就不能设为星号，必须指定明确的、与请求网页一致的域名。同时，Cookie 依然遵循同源政策，只有用服务器域名设置的 Cookie 才会上传，其他域名的 Cookie 并不会上传，且（跨域）原网页代码中的`document.cookie`也无法读取服务器域名下的 Cookie。
+需要注意的是，如果服务器要求浏览器发送 Cookie，`Access-Control-Allow-Origin`就不能设为星号，必须指定明确的、与请求网页一致的域名。同时，Cookie 依然遵循同源政策，只有用服务器域名设置的 Cookie 才会上传，其他域名的 Cookie 并不会上传，且（跨源）原网页代码中的`document.cookie`也无法读取服务器域名下的 Cookie。
 
 ## 非简单请求
 
@@ -107,7 +107,7 @@ xhr.withCredentials = false;
 
 非简单请求是那种对服务器提出特殊要求的请求，比如请求方法是`PUT`或`DELETE`，或者`Content-Type`字段的类型是`application/json`。
 
-非简单请求的 CORS 请求，会在正式通信之前，增加一次 HTTP 查询请求，称为“预检”请求（preflight）。浏览器先询问服务器，当前网页所在的域名是否在服务器的许可名单之中，以及可以使用哪些 HTTP 方法和头信息字段。只有得到肯定答复，浏览器才会发出正式的`XMLHttpRequest`请求，否则就报错。这是为了防止这些新增的请求，对传统的没有 CORS 支持的服务器形成压力，给服务器一个提前拒绝的机会，这样可以防止服务器收到大量`DELETE`和`PUT`请求，这些传统的表单不可能跨域发出的请求。
+非简单请求的 CORS 请求，会在正式通信之前，增加一次 HTTP 查询请求，称为“预检”请求（preflight）。浏览器先询问服务器，当前网页所在的域名是否在服务器的许可名单之中，以及可以使用哪些 HTTP 方法和头信息字段。只有得到肯定答复，浏览器才会发出正式的`XMLHttpRequest`请求，否则就报错。这是为了防止这些新增的请求，对传统的没有 CORS 支持的服务器形成压力，给服务器一个提前拒绝的机会，这样可以防止服务器收到大量`DELETE`和`PUT`请求，这些传统的表单不可能跨源发出的请求。
 
 下面是一段浏览器的 JavaScript 脚本。
 
@@ -199,7 +199,7 @@ Access-Control-Max-Age: 1728000
 
 **（1）`Access-Control-Allow-Methods`**
 
-该字段必需，它的值是逗号分隔的一个字符串，表明服务器支持的所有跨域请求的方法。注意，返回的是所有支持的方法，而不单是浏览器请求的那个方法。这是为了避免多次“预检”请求。
+该字段必需，它的值是逗号分隔的一个字符串，表明服务器支持的所有跨源请求的方法。注意，返回的是所有支持的方法，而不单是浏览器请求的那个方法。这是为了避免多次“预检”请求。
 
 **（2）`Access-Control-Allow-Headers`**
 

From 0887afc35d3ada0e8b4e8307ee4225c99815622a Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 23 Jul 2023 14:29:52 +0800
Subject: [PATCH 099/123] docs(stdlib/JSON): add
 JSON.parse(JSON.stringify(obj))

---
 docs/stdlib/json.md | 9 +++++++++
 package.json        | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/docs/stdlib/json.md b/docs/stdlib/json.md
index dfe1b76..c395d46 100644
--- a/docs/stdlib/json.md
+++ b/docs/stdlib/json.md
@@ -395,6 +395,15 @@ JSON.parse('{"a": 1, "b": 2}', f)
 
 上面代码中，`JSON.parse()`的第二个参数是一个函数，如果键名是`a`，该函数会将键值加上10。
 
+`JSON.parse()`和`JSON.stringify()`可以结合使用，像下面这样写，实现对象的深拷贝。
+
+```javascript
+JSON.parse(JSON.stringify(obj))
+```
+
+上面这种写法，可以深度克隆一个对象，但是对象内部不能有 JSON
+不允许的数据类型，比如函数、正则对象、日期对象等。
+
 ## 参考链接
 
 - MDN, [Using native JSON](https://developer.mozilla.org/en-US/docs/Using_native_JSON)
diff --git a/package.json b/package.json
index b67124a..f9e429a 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   },
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
-    "gh-pages": "^3.2.3",
+    "gh-pages": "5.x",
     "husky": "^4.3.8",
     "loppo": "^0.6.24",
     "loppo-theme-wangdoc": "^0.6.1"

From 9f7eb468eea0fbb96de409b1b04dccfdd1afdc67 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=BE=BE=E5=B8=85?=
 <21106848+sdshaoda@users.noreply.github.com>
Date: Thu, 10 Aug 2023 17:07:57 +0800
Subject: [PATCH 100/123] docs(types/general): add ES6 BigInt type (#260)

---
 docs/types/general.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/general.md b/docs/types/general.md
index 8454b44..6d512ef 100644
--- a/docs/types/general.md
+++ b/docs/types/general.md
@@ -2,7 +2,7 @@
 
 ## 简介
 
-JavaScript 语言的每一个值，都属于某一种数据类型。JavaScript 的数据类型，共有六种。（ES6 又新增了第七种 Symbol 类型的值，本教程不涉及。）
+JavaScript 语言的每一个值，都属于某一种数据类型。JavaScript 的数据类型，共有六种。（ES6 又新增了 Symbol 和 BigInt 数据类型，本教程不涉及。）
 
 - 数值（number）：整数和小数（比如`1`和`3.14`）。
 - 字符串（string）：文本（比如`Hello World`）。

From f05cc4a83f1ae5ba1369f0120b8d9df4384fdb23 Mon Sep 17 00:00:00 2001
From: thinkasany <117748716+thinkasany@users.noreply.github.com>
Date: Thu, 17 Aug 2023 11:53:52 +0800
Subject: [PATCH 101/123] docs(general): use '===' replace '==' (#261)

---
 docs/async/general.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/async/general.md b/docs/async/general.md
index a4c9747..a745bfe 100644
--- a/docs/async/general.md
+++ b/docs/async/general.md
@@ -271,7 +271,7 @@ function launcher() {
       running--;
       if(items.length > 0) {
         launcher();
-      } else if(running == 0) {
+      } else if(running === 0) {
         final(results);
       }
     });

From 4f58c96e9c43936ec2489f392d8c033fb1382881 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 30 Dec 2023 14:47:56 +0800
Subject: [PATCH 102/123] docs(stdlib/regex): fixed #263

---
 docs/stdlib/regexp.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/stdlib/regexp.md b/docs/stdlib/regexp.md
index cc0f002..5a1d884 100644
--- a/docs/stdlib/regexp.md
+++ b/docs/stdlib/regexp.md
@@ -150,7 +150,7 @@ r2.exec(s) // null
 
 上面代码中，正则对象`r1`匹配成功，返回一个数组，成员是匹配结果；正则对象`r2`匹配失败，返回`null`。
 
-如果正则表示式包含圆括号（即含有“组匹配”），则返回的数组会包括多个成员。第一个成员是整个匹配成功的结果，后面的成员就是圆括号对应的匹配成功的组。也就是说，第二个成员对应第一个括号，第三个成员对应第二个括号，以此类推。整个数组的`length`属性等于组匹配的数量再加1。
+如果正则表达式包含圆括号（即含有“组匹配”），则返回的数组会包括多个成员。第一个成员是整个匹配成功的结果，后面的成员就是圆括号对应的匹配成功的组。也就是说，第二个成员对应第一个括号，第三个成员对应第二个括号，以此类推。整个数组的`length`属性等于组匹配的数量再加1。
 
 ```javascript
 var s = '_x_x';

From 35bbedb38227416be049585c3c5bab0753fdf913 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 3 Jan 2024 08:40:54 +0800
Subject: [PATCH 103/123] docs(oop/strict): fixed #265

---
 docs/oop/strict.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/oop/strict.md b/docs/oop/strict.md
index 3dffbe6..341f757 100644
--- a/docs/oop/strict.md
+++ b/docs/oop/strict.md
@@ -12,7 +12,7 @@
 
 - 明确禁止一些不合理、不严谨的语法，减少 JavaScript 语言的一些怪异行为。
 - 增加更多报错的场合，消除代码运行的一些不安全之处，保证代码运行的安全。
-- 提高编译器效率，增加运行速度。
+- 提高编译器效率，提升运行速度。
 - 为未来新版本的 JavaScript 语法做好铺垫。
 
 总之，严格模式体现了 JavaScript 更合理、更安全、更严谨的发展方向。

From 1868d0a647596d4f2abaf2ebb6489eeebc6689b2 Mon Sep 17 00:00:00 2001
From: Enoch Gao <enochgao@qq.com>
Date: Fri, 5 Jan 2024 19:33:02 +0800
Subject: [PATCH 104/123] =?UTF-8?q?fix:=20=E4=BF=AE=E5=A4=8DscrollHeight?=
 =?UTF-8?q?=E6=B3=A8=E9=87=8A=E9=94=99=E8=AF=AF=20(#266)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/dom/element.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/dom/element.md b/docs/dom/element.md
index 2b5ea6d..6a73887 100644
--- a/docs/dom/element.md
+++ b/docs/dom/element.md
@@ -371,8 +371,8 @@ document.body.scrollHeight
 
 ```javascript
 // HTML 代码如下
-// <div id="myDiv" style="height: 200px; overflow: hidden;">...<div>
-document.getElementById('myDiv').scrollHeight // 356
+// <div id="myDiv" style="height: 200px; overflow: hidden;">...</div>
+document.getElementById('myDiv').scrollHeight // 200
 ```
 
 上面代码中，即使`myDiv`元素的 CSS 高度只有200像素，且溢出部分不可见，但是`scrollHeight`仍然会返回该元素的原始高度。

From d9420c305423feb7f1ae8dd70fd4fd95ab7b76e1 Mon Sep 17 00:00:00 2001
From: Enoch Gao <enochgao@qq.com>
Date: Tue, 9 Jan 2024 09:34:09 +0800
Subject: [PATCH 105/123] =?UTF-8?q?fix:=20=E5=AF=B9=E9=BD=903.1observe()?=
 =?UTF-8?q?=E6=A1=88=E4=BE=8B=E4=BB=A3=E7=A0=81=20(#267)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/dom/mutationobserver.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/dom/mutationobserver.md b/docs/dom/mutationobserver.md
index ace5853..0715565 100644
--- a/docs/dom/mutationobserver.md
+++ b/docs/dom/mutationobserver.md
@@ -44,7 +44,7 @@ var observer = new MutationObserver(function (mutations, observer) {
 ```javascript
 var article = document.querySelector('article');
 
-var  options = {
+var options = {
   'childList': true,
   'attributes':true
 } ;

From d77ebe841af28628c8d3c85d967b89e225ce05b5 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 3 Feb 2024 12:53:55 +0800
Subject: [PATCH 106/123] docs(bom/same-origin): fix error

---
 docs/bom/same-origin.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/bom/same-origin.md b/docs/bom/same-origin.md
index 50577ce..4a11a0b 100644
--- a/docs/bom/same-origin.md
+++ b/docs/bom/same-origin.md
@@ -194,7 +194,7 @@ window.addEventListener('message', function (e) {
 `message`事件的参数是事件对象`event`，提供以下三个属性。
 
 > - `event.source`：发送消息的窗口
-> - `event.origin`: 消息发向的网址
+> - `event.origin`: 消息发送者的源（origin），即协议、域名、端口。
 > - `event.data`: 消息内容
 
 下面的例子是，子窗口通过`event.source`属性引用父窗口，然后发送消息。
@@ -208,7 +208,7 @@ function receiveMessage(event) {
 
 上面代码有几个地方需要注意。首先，`receiveMessage`函数里面没有过滤信息的来源，任意网址发来的信息都会被处理。其次，`postMessage`方法中指定的目标窗口的网址是一个星号，表示该信息可以向任意网址发送。通常来说，这两种做法是不推荐的，因为不够安全，可能会被恶意利用。
 
-`event.origin`属性可以过滤不是发给本窗口的消息。
+`event.origin`属性可以过滤非许可地址发来的消息。
 
 ```javascript
 window.addEventListener('message', receiveMessage);

From a13288616e6f8409d9f1575db3707b2b524793d5 Mon Sep 17 00:00:00 2001
From: Enoch Gao <enochgao@qq.com>
Date: Sun, 4 Feb 2024 19:05:08 +0800
Subject: [PATCH 107/123] =?UTF-8?q?fix:=20=E4=BF=AE=E5=A4=8D=E6=96=87?=
 =?UTF-8?q?=E6=A1=A3=E5=AD=97=E7=AC=A6=E4=B8=B2=E9=94=99=E8=AF=AF=20(#268)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/stdlib/object.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/stdlib/object.md b/docs/stdlib/object.md
index 51ba1e6..24b44ca 100644
--- a/docs/stdlib/object.md
+++ b/docs/stdlib/object.md
@@ -308,7 +308,7 @@ var obj = {};
 obj.toString() // "[object Object]"
 ```
 
-上面代码调用空对象的`toString`方法，结果返回一个字符串`object Object`，其中第二个`Object`表示该值的构造函数。这是一个十分有用的判断数据类型的方法。
+上面代码调用空对象的`toString`方法，结果返回一个字符串`[object Object]`，其中第二个`Object`表示该值的构造函数。这是一个十分有用的判断数据类型的方法。
 
 由于实例对象可能会自定义`toString`方法，覆盖掉`Object.prototype.toString`方法，所以为了得到类型字符串，最好直接使用`Object.prototype.toString`方法。通过函数的`call`方法，可以在任意值上调用这个方法，帮助我们判断这个值的类型。
 

From 3a7a19ac749d9e7a08f88d4566c01c9c9c31e269 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 24 Feb 2024 23:36:43 +0800
Subject: [PATCH 108/123] docs(stdlib/date): fixed #269

---
 docs/stdlib/date.md | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/docs/stdlib/date.md b/docs/stdlib/date.md
index a44b2c8..d0475da 100644
--- a/docs/stdlib/date.md
+++ b/docs/stdlib/date.md
@@ -317,15 +317,15 @@ d.toTimeString() // "00:00:00 GMT+0800 (CST)"
 var d = new Date(2013, 0, 1);
 
 d.toLocaleString()
-// 中文版浏览器为"2013年1月1日 上午12:00:00"
+// 中文版浏览器为"2013/1/1 00:00:00"
 // 英文版浏览器为"1/1/2013 12:00:00 AM"
 
 d.toLocaleDateString()
-// 中文版浏览器为"2013年1月1日"
+// 中文版浏览器为"2013/1/1"
 // 英文版浏览器为"1/1/2013"
 
 d.toLocaleTimeString()
-// 中文版浏览器为"上午12:00:00"
+// 中文版浏览器为"00:00:00"
 // 英文版浏览器为"12:00:00 AM"
 ```
 
@@ -343,13 +343,13 @@ dateObj.toLocaleTimeString([locales[, options]])
 var d = new Date(2013, 0, 1);
 
 d.toLocaleString('en-US') // "1/1/2013, 12:00:00 AM"
-d.toLocaleString('zh-CN') // "2013/1/1 上午12:00:00"
+d.toLocaleString('zh-CN') // "2013/1/1 00:00:00"
 
 d.toLocaleDateString('en-US') // "1/1/2013"
 d.toLocaleDateString('zh-CN') // "2013/1/1"
 
 d.toLocaleTimeString('en-US') // "12:00:00 AM"
-d.toLocaleTimeString('zh-CN') // "上午12:00:00"
+d.toLocaleTimeString('zh-CN') // "00:00:00"
 ```
 
 `options`配置对象有以下属性。

From 7070f24255dc5c093652368698b409e04e6380ae Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Fri, 19 Apr 2024 22:01:55 +0800
Subject: [PATCH 109/123] docs(types/number): fixed #270

---
 docs/types/number.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/types/number.md b/docs/types/number.md
index b61dc6a..bb9c1b0 100644
--- a/docs/types/number.md
+++ b/docs/types/number.md
@@ -43,7 +43,7 @@ JavaScript 内部，所有数字都是以64位浮点数形式储存，即使整
 
 上面公式是正常情况下（指数部分在0到2047之间），一个数在 JavaScript 内部实际的表示形式。
 
-精度最多只能到53个二进制位，这意味着，绝对值小于2的53次方的整数，即-2<sup>53</sup>到2<sup>53</sup>，都可以精确表示。
+精度最多只能到53个二进制位，这意味着，绝对值小于2的53次方的整数，即-2<sup>53</sup> + 1 到 2<sup>53</sup> - 1，都可以精确表示。
 
 ```javascript
 Math.pow(2, 53)

From 83aea13cd3626db7ca14f65e42224b5cca3cfa02 Mon Sep 17 00:00:00 2001
From: cogic <72649343+cogic@users.noreply.github.com>
Date: Mon, 22 Apr 2024 23:25:03 +0800
Subject: [PATCH 110/123] docs(dom): fix text (#271)

---
 docs/dom/document.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/dom/document.md b/docs/dom/document.md
index 3eb1d02..c3be770 100644
--- a/docs/dom/document.md
+++ b/docs/dom/document.md
@@ -363,7 +363,7 @@ document.replaceChild(
 );
 ```
 
-上面代码中，第一步生成一个新的 HTML 文档`doc`，然后用它的根元素`document.documentElement`替换掉`document.documentElement`。这会使得当前文档的内容全部消失，变成`hello world`。
+上面代码中，第一步生成一个新的 HTML 文档`doc`，然后用它的根元素`doc.documentElement`替换掉`document.documentElement`。这会使得当前文档的内容全部消失，变成`hello world`。
 
 ## 方法
 
@@ -716,7 +716,7 @@ var element  = document.getElementById('ul');
 element.appendChild(docfrag);
 ```
 
-上面代码中，文档片断`docfrag`包含四个`<li>`节点，这些子节点被一次性插入了当前文档。
+上面代码中，文档片段`docfrag`包含四个`<li>`节点，这些子节点被一次性插入了当前文档。
 
 ### document.createEvent()
 

From 2092d3b237de79db450718dc985222642b91bee2 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 24 Apr 2024 16:59:12 +0800
Subject: [PATCH 111/123] docs(dom/css): fixed #272

---
 docs/dom/css.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/dom/css.md b/docs/dom/css.md
index 5a1d39a..b8ac695 100644
--- a/docs/dom/css.md
+++ b/docs/dom/css.md
@@ -292,7 +292,7 @@ CSS.supports('display: table-cell;') // false
 
 行内样式（inline style）具有最高的优先级，改变行内样式，通常会立即反映出来。但是，网页元素最终的样式是综合各种规则计算出来的。因此，如果想得到元素实际的样式，只读取行内样式是不够的，需要得到浏览器最终计算出来的样式规则。
 
-`window.getComputedStyle`方法，就用来返回浏览器计算后得到的最终规则。它接受一个节点对象作为参数，返回一个 CSSStyleDeclaration  实例，包含了指定节点的最终样式信息。所谓“最终样式信息”，指的是各种 CSS 规则叠加后的结果。
+`window.getComputedStyle()`方法，就用来返回浏览器计算后得到的最终规则。它接受一个节点对象作为参数，返回一个 CSSStyleDeclaration 实例，包含了指定节点的最终样式信息。所谓“最终样式信息”，指的是各种 CSS 规则叠加后的结果。
 
 ```javascript
 var div = document.querySelector('div');
@@ -328,7 +328,7 @@ var height = styleObj.getPropertyValue('height');
 - CSSStyleDeclaration 实例返回的 CSS 值都是绝对单位。比如，长度都是像素单位（返回值包括`px`后缀），颜色是`rgb(#, #, #)`或`rgba(#, #, #, #)`格式。
 - CSS 规则的简写形式无效。比如，想读取`margin`属性的值，不能直接读，只能读`marginLeft`、`marginTop`等属性；再比如，`font`属性也是不能直接读的，只能读`font-size`等单个属性。
 - 如果读取 CSS 原始的属性名，要用方括号运算符，比如`styleObj['z-index']`；如果读取骆驼拼写法的 CSS 属性名，可以直接读取`styleObj.zIndex`。
-- 该方法返回的 CSSStyleDeclaration 实例的`cssText`属性无效，返回`undefined`。
+- 该方法返回的 CSSStyleDeclaration 实例的`cssText`属性总是返回空字符串。
 
 ## CSS 伪元素
 

From eefffcf3ce979fe6a0cd9c94ad84425a48022b8e Mon Sep 17 00:00:00 2001
From: cogic <72649343+cogic@users.noreply.github.com>
Date: Thu, 25 Apr 2024 15:02:47 +0800
Subject: [PATCH 112/123] docs(dom/css): fix text (#273)

---
 docs/dom/css.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/dom/css.md b/docs/dom/css.md
index b8ac695..b4f1a2d 100644
--- a/docs/dom/css.md
+++ b/docs/dom/css.md
@@ -401,9 +401,9 @@ myStyleSheet instanceof StyleSheet // true
 
 注意，`disabled`属性只能在 JavaScript 脚本中设置，不能在 HTML 语句中设置。
 
-**（2）Stylesheet.href**
+**（2）StyleSheet.href**
 
-`Stylesheet.href`返回样式表的网址。对于内嵌样式表，该属性返回`null`。该属性只读。
+`StyleSheet.href`返回样式表的网址。对于内嵌样式表，该属性返回`null`。该属性只读。
 
 ```javascript
 document.styleSheets[0].href

From 2f55be82dc7f810ca220c44b02606656868c4d39 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 4 May 2024 12:03:27 +0800
Subject: [PATCH 113/123] docs(dom/document): fixed #274

---
 docs/dom/document.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/docs/dom/document.md b/docs/dom/document.md
index c3be770..7af7f3a 100644
--- a/docs/dom/document.md
+++ b/docs/dom/document.md
@@ -69,7 +69,10 @@ document.scrollingElement.scrollTop = 0;
 `document.fullscreenElement`属性返回当前以全屏状态展示的 DOM 元素。如果不是全屏状态，该属性返回`null`。
 
 ```javascript
-if (document.fullscreenElement.nodeName == 'VIDEO') {
+if (
+  document.fullscreenElement && 
+  document.fullscreenElement.nodeName == 'VIDEO'
+) {
   console.log('全屏播放视频');
 }
 ```

From 370bb5f9ea17a168fdcc9dc6da230e07e5584aed Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 9 Jun 2024 16:40:57 +0800
Subject: [PATCH 114/123] refactor: update dependencies

---
 package.json | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/package.json b/package.json
index f9e429a..6f29bac 100644
--- a/package.json
+++ b/package.json
@@ -14,11 +14,6 @@
     "server": "loppo server",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
-  "husky": {
-    "hooks": {
-      "pre-push": "npm update"
-    }
-  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/wangdoc/javascript-tutorial.git"
@@ -35,9 +30,8 @@
   },
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
-    "gh-pages": "5.x",
-    "husky": "^4.3.8",
+    "gh-pages": "6.x",
     "loppo": "^0.6.24",
-    "loppo-theme-wangdoc": "^0.6.1"
+    "loppo-theme-wangdoc": "^0.7.1"
   }
 }

From 56a50937db811cbfda8c3a4725e59cc6a5e4f782 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sun, 9 Jun 2024 16:45:42 +0800
Subject: [PATCH 115/123] refactor: update github action script

---
 .github/workflows/wangdoc.yml | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/.github/workflows/wangdoc.yml b/.github/workflows/wangdoc.yml
index 80f8bfe..c3e5cbe 100644
--- a/.github/workflows/wangdoc.yml
+++ b/.github/workflows/wangdoc.yml
@@ -10,28 +10,27 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           persist-credentials: false
       - name: Setup Node.js
-        uses: actions/setup-node@main
+        uses: actions/setup-node@v4
         with:
-          node-version: '14'
+          node-version: 'latest'
       - name: Install dependencies
         run: npm install
       - name: Build pages
         run: npm run build
       - name: Deploy to website
-        uses: JamesIves/github-pages-deploy-action@3.7.1
+        uses: JamesIves/github-pages-deploy-action@v4
         with:
-          GIT_CONFIG_NAME: wangdoc-bot
-          GIT_CONFIG_EMAIL: yifeng.ruan@gmail.com
-          REPOSITORY_NAME: wangdoc/website
-          ACCESS_TOKEN: ${{ secrets.WANGDOC_BOT_TOKEN }}
-          BASE_BRANCH: master
-          BRANCH: master # The branch the action should deploy to.
-          FOLDER: dist # The folder the action should deploy.
-          TARGET_FOLDER: dist/javascript
-          CLEAN: true # Automatically remove deleted files from the deploy branch
-          COMMIT_MESSAGE: update from JavaScript tutorial
+          git-config-name: wangdoc-bot
+          git-config-email: yifeng.ruan@gmail.com
+          repository-name: wangdoc/website
+          token: ${{ secrets.WANGDOC_BOT_TOKEN }}
+          branch: master # The branch the action should deploy to.
+          folder: dist # The folder the action should deploy.
+          target-folder: dist/javascript
+          clean: true # Automatically remove deleted files from the deploy branch
+          commit-message: update from JavaScript tutorial
 

From 5aa689b301aae830a6315123334b66763a12f50c Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Mon, 24 Jun 2024 14:04:54 +0800
Subject: [PATCH 116/123] docs(bom/window): fixed #277

---
 docs/bom/window.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/bom/window.md b/docs/bom/window.md
index a012d61..a873fae 100644
--- a/docs/bom/window.md
+++ b/docs/bom/window.md
@@ -579,7 +579,7 @@ var start = null;
 function step(timestamp) {
   if (!start) start = timestamp;
   var progress = timestamp - start;
-  // 元素不断向左移，最大不超过200像素
+  // 元素不断向右移，最大不超过200像素
   element.style.left = Math.min(progress / 10, 200) + 'px';
   // 如果距离第一次执行不超过 2000 毫秒，
   // 就继续执行动画

From 200b44e6d98e73e71595452d72b24a7d201ee50b Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Thu, 4 Jul 2024 19:30:11 +0800
Subject: [PATCH 117/123] docs(oop/this): fixed #279

---
 docs/oop/this.md | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/docs/oop/this.md b/docs/oop/this.md
index 6668047..1913fe3 100644
--- a/docs/oop/this.md
+++ b/docs/oop/this.md
@@ -679,19 +679,19 @@ Array.prototype.slice.apply({length: 1}) // [undefined]
 前面的按钮点击事件的例子，可以改写如下。
 
 ```javascript
-var o = new Object();
+var obj = new Object();
 
-o.f = function () {
-  console.log(this === o);
+var func = function () {
+  console.log(this === obj);
 }
 
-var f = function (){
-  o.f.apply(o);
-  // 或者 o.f.call(o);
+var handler = function (){
+  func.apply(obj);
+  // 或者 f.call(obj);
 };
 
 // jQuery 的写法
-$('#button').on('click', f);
+$('#button').on('click', handler);
 ```
 
 上面代码中，点击按钮以后，控制台将会显示`true`。由于`apply()`方法（或者`call()`方法）不仅绑定函数执行时所在的对象，还会立即执行函数，因此不得不把绑定语句写在一个函数体内。更简洁的写法是采用下面介绍的`bind()`方法。

From 1df4272d579f407add746ecf73ff6a664e500364 Mon Sep 17 00:00:00 2001
From: Linho <linho1219@outlook.com>
Date: Tue, 24 Sep 2024 17:22:49 +0800
Subject: [PATCH 118/123] =?UTF-8?q?=E7=BB=9F=E4=B8=80=E5=BC=95=E5=8F=B7=20?=
 =?UTF-8?q?(#282)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* 统一引号

* 统一引号
---
 docs/types/null-undefined-boolean.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/types/null-undefined-boolean.md b/docs/types/null-undefined-boolean.md
index 9a76679..129dda3 100644
--- a/docs/types/null-undefined-boolean.md
+++ b/docs/types/null-undefined-boolean.md
@@ -35,7 +35,7 @@ undefined == null
 
 既然含义与用法都差不多，为什么要同时设置两个这样的值，这不是无端增加复杂度，令初学者困扰吗？这与历史原因有关。
 
-1995年 JavaScript 诞生时，最初像 Java 一样，只设置了`null`表示"无"。根据 C 语言的传统，`null`可以自动转为`0`。
+1995年 JavaScript 诞生时，最初像 Java 一样，只设置了`null`表示“无”。根据 C 语言的传统，`null`可以自动转为`0`。
 
 ```javascript
 Number(null) // 0
@@ -46,7 +46,7 @@ Number(null) // 0
 
 但是，JavaScript 的设计者 Brendan Eich，觉得这样做还不够。首先，第一版的 JavaScript 里面，`null`就像在 Java 里一样，被当成一个对象，Brendan Eich 觉得表示“无”的值最好不是对象。其次，那时的 JavaScript 不包括错误处理机制，Brendan Eich 觉得，如果`null`自动转为0，很不容易发现错误。
 
-因此，他又设计了一个`undefined`。区别是这样的：`null`是一个表示“空”的对象，转为数值时为`0`；`undefined`是一个表示"此处无定义"的原始值，转为数值时为`NaN`。
+因此，他又设计了一个`undefined`。区别是这样的：`null`是一个表示“空”的对象，转为数值时为`0`；`undefined`是一个表示“此处无定义”的原始值，转为数值时为`NaN`。
 
 ```javascript
 Number(undefined) // NaN

From 5f4a988c6087dcfd0785f9443d0a8e2db54c9f65 Mon Sep 17 00:00:00 2001
From: Linho <linho1219@outlook.com>
Date: Tue, 24 Sep 2024 22:04:45 +0800
Subject: [PATCH 119/123] =?UTF-8?q?=E8=A1=A5=E5=85=85=20NaN=20=E8=BF=90?=
 =?UTF-8?q?=E7=AE=97=E8=A7=84=E5=88=99=20(#283)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/types/number.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/types/number.md b/docs/types/number.md
index bb9c1b0..53ebfb5 100644
--- a/docs/types/number.md
+++ b/docs/types/number.md
@@ -280,6 +280,12 @@ NaN * 32 // NaN
 NaN / 32 // NaN
 ```
 
+但是，ES6 引入指数运算符（`**`）后，出现了一个例外。
+
+```javascript
+NaN ** 0 // 1
+```
+
 ### Infinity
 
 **（1）含义**

From 79dcc9bc1799e3a432b0251e12ee07a4ef9727d6 Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 25 Sep 2024 17:08:58 +0800
Subject: [PATCH 120/123] style: force update theme

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 6f29bac..479b7bb 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,6 @@
   "dependencies": {
     "gh-pages": "6.x",
     "loppo": "^0.6.24",
-    "loppo-theme-wangdoc": "^0.7.1"
+    "loppo-theme-wangdoc": "^0.7.3"
   }
 }

From 2500a083ca4b38d0db357cebd8effe3090208bf0 Mon Sep 17 00:00:00 2001
From: Enoch Gao <enochgao@qq.com>
Date: Tue, 10 Dec 2024 07:21:34 +0800
Subject: [PATCH 121/123] =?UTF-8?q?fix(docs):=206.2=E6=B3=A8=E9=87=8A?=
 =?UTF-8?q?=E9=94=99=E8=AF=AF=20(#287)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/oop/this.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/oop/this.md b/docs/oop/this.md
index 1913fe3..6792c30 100644
--- a/docs/oop/this.md
+++ b/docs/oop/this.md
@@ -687,7 +687,7 @@ var func = function () {
 
 var handler = function (){
   func.apply(obj);
-  // 或者 f.call(obj);
+  // 或者 func.call(obj);
 };
 
 // jQuery 的写法

From e4622c26cc36dea67db450f7af2705aee63c5c4a Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Wed, 25 Dec 2024 10:09:38 +0800
Subject: [PATCH 122/123] docs(oop/strict): fixed typo

---
 docs/oop/strict.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/oop/strict.md b/docs/oop/strict.md
index 341f757..cc339c8 100644
--- a/docs/oop/strict.md
+++ b/docs/oop/strict.md
@@ -108,7 +108,7 @@ function notStrict() {
 ```javascript
 // 对只读属性赋值会报错
 'use strict';
-Object.defineProperty({}, 'a', {
+var obj = Object.defineProperty({}, 'a', {
   value: 37,
   writable: false
 });

From a428ce98018c97fc5880c8b553e9218f1936f14a Mon Sep 17 00:00:00 2001
From: Enoch Gao <enochgao@qq.com>
Date: Tue, 30 Sep 2025 12:52:05 +0800
Subject: [PATCH 123/123] =?UTF-8?q?fix(docs):=20=E4=BF=AE=E5=A4=8D?=
 =?UTF-8?q?=E5=BC=95=E7=94=A8=E7=AB=A0=E8=8A=82=E5=90=8D=E7=A7=B0=E9=94=99?=
 =?UTF-8?q?=E8=AF=AF=EF=BC=8C=E9=81=BF=E5=85=8D=E9=98=85=E8=AF=BB=E6=A8=A1?=
 =?UTF-8?q?=E7=B3=8A=E4=B8=8D=E6=B8=85=20(#291)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/stdlib/object.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/stdlib/object.md b/docs/stdlib/object.md
index 24b44ca..783175c 100644
--- a/docs/stdlib/object.md
+++ b/docs/stdlib/object.md
@@ -56,7 +56,7 @@ obj instanceof Object // true
 
 `instanceof`运算符用来验证，一个对象是否为指定的构造函数的实例。`obj instanceof Object`返回`true`，就表示`obj`对象是`Object`的实例。
 
-如果参数是原始类型的值，`Object`方法将其转为对应的包装对象的实例（参见《原始类型的包装对象》一章）。
+如果参数是原始类型的值，`Object`方法将其转为对应的包装对象的实例（参见《包装对象》一章）。
 
 ```javascript
 var obj = Object(1);
@@ -156,7 +156,7 @@ var obj = {
 Object.getOwnPropertyNames(obj) // ["p1", "p2"]
 ```
 
-对于一般的对象来说，`Object.keys()`和`Object.getOwnPropertyNames()`返回的结果是一样的。只有涉及不可枚举属性时，才会有不一样的结果。`Object.keys`方法只返回可枚举的属性（详见《对象属性的描述对象》一章），`Object.getOwnPropertyNames`方法还返回不可枚举的属性名。
+对于一般的对象来说，`Object.keys()`和`Object.getOwnPropertyNames()`返回的结果是一样的。只有涉及不可枚举属性时，才会有不一样的结果。`Object.keys`方法只返回可枚举的属性（详见《属性描述对象》一章），`Object.getOwnPropertyNames`方法还返回不可枚举的属性名。
 
 ```javascript
 var a = ['Hello', 'World'];
@@ -231,7 +231,7 @@ obj.valueOf() === obj // true
 
 上面代码比较`obj.valueOf()`与`obj`本身，两者是一样的。
 
-`valueOf`方法的主要用途是，JavaScript 自动类型转换时会默认调用这个方法（详见《数据类型转换》一章）。
+`valueOf`方法的主要用途是，JavaScript 自动类型转换时会默认调用这个方法（详见《数据类型的转换》一章）。
 
 ```javascript
 var obj = new Object();