@@ -455,9 +461,9 @@
}
}
```
-
+
-
+
State is similar to props, but it is private and fully controlled by the component. i.e, It is not accessible to any component other than the one that owns and sets it.
9. ### What are props in React?
@@ -3796,6 +3802,7 @@
handleSubmit = () => {
console.log("Input Value is: ", this.input.value)
}
+ ```
render () {
@@ -3810,19 +3817,19 @@
}
}
```
-
+
But our expectation is for the ref callback to get called once, when the component mounts. One quick fix is to use the ES7 class property syntax to define the function
-
+
```jsx
class UserForm extends Component {
handleSubmit = () => {
console.log("Input Value is: ", this.input.value)
}
-
+
setSearchInput = (input) => {
this.input = input
}
-
+
render () {
return (
+
+点击此 [全栈修仙之路 - 前端进阶篇](http://book.bugstack.cn/#s/6I-ldR3A) 链接，即可免费下载电子书。
+
### Table of Contents
| No. | Questions |
@@ -440,12 +446,12 @@
class User extends React.Component {
constructor(props) {
super(props)
-
+
this.state = {
message: 'Welcome to React world'
}
}
-
+
render() {
return (