diff --git a/solution/0700-0799/0731.My Calendar II/README.md b/solution/0700-0799/0731.My Calendar II/README.md
index 1971961290950..04d8becf7d485 100644
--- a/solution/0700-0799/0731.My Calendar II/README.md	
+++ b/solution/0700-0799/0731.My Calendar II/README.md	
@@ -208,6 +208,43 @@ func (this *MyCalendarTwo) Book(start int, end int) bool {
  */
 ```
 
+#### JavaScript
+
+```js
+var MyCalendarTwo = function () {
+    this.events = [];
+    this.overlaps = [];
+};
+
+/**
+ * @param {number} start
+ * @param {number} end
+ * @return {boolean}
+ */
+MyCalendarTwo.prototype.book = function (start, end) {
+    for (let [s, e] of this.overlaps) {
+        if (Math.max(start, s) < Math.min(end, e)) {
+            return false;
+        }
+    }
+
+    for (let [s, e] of this.events) {
+        if (Math.max(start, s) < Math.min(end, e)) {
+            this.overlaps.push([Math.max(start, s), Math.min(end, e)]);
+        }
+    }
+
+    this.events.push([start, end]);
+    return true;
+};
+
+/**
+ * Your MyCalendarTwo object will be instantiated and called as such:
+ * var obj = new MyCalendarTwo()
+ * var param_1 = obj.book(start,end)
+ */
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git a/solution/0700-0799/0731.My Calendar II/README_EN.md b/solution/0700-0799/0731.My Calendar II/README_EN.md
index 5d3abb9bcf791..b3f664980ff95 100644
--- a/solution/0700-0799/0731.My Calendar II/README_EN.md	
+++ b/solution/0700-0799/0731.My Calendar II/README_EN.md	
@@ -206,6 +206,43 @@ func (this *MyCalendarTwo) Book(start int, end int) bool {
  */
 ```
 
+#### JavaScript
+
+```js
+var MyCalendarTwo = function () {
+    this.events = [];
+    this.overlaps = [];
+};
+
+/**
+ * @param {number} start
+ * @param {number} end
+ * @return {boolean}
+ */
+MyCalendarTwo.prototype.book = function (start, end) {
+    for (let [s, e] of this.overlaps) {
+        if (Math.max(start, s) < Math.min(end, e)) {
+            return false;
+        }
+    }
+
+    for (let [s, e] of this.events) {
+        if (Math.max(start, s) < Math.min(end, e)) {
+            this.overlaps.push([Math.max(start, s), Math.min(end, e)]);
+        }
+    }
+
+    this.events.push([start, end]);
+    return true;
+};
+
+/**
+ * Your MyCalendarTwo object will be instantiated and called as such:
+ * var obj = new MyCalendarTwo()
+ * var param_1 = obj.book(start,end)
+ */
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git a/solution/0700-0799/0731.My Calendar II/Solution.js b/solution/0700-0799/0731.My Calendar II/Solution.js
new file mode 100644
index 0000000000000..53cfad370e6f7
--- /dev/null
+++ b/solution/0700-0799/0731.My Calendar II/Solution.js	
@@ -0,0 +1,32 @@
+var MyCalendarTwo = function () {
+    this.events = [];
+    this.overlaps = [];
+};
+
+/**
+ * @param {number} start
+ * @param {number} end
+ * @return {boolean}
+ */
+MyCalendarTwo.prototype.book = function (start, end) {
+    for (let [s, e] of this.overlaps) {
+        if (Math.max(start, s) < Math.min(end, e)) {
+            return false;
+        }
+    }
+
+    for (let [s, e] of this.events) {
+        if (Math.max(start, s) < Math.min(end, e)) {
+            this.overlaps.push([Math.max(start, s), Math.min(end, e)]);
+        }
+    }
+
+    this.events.push([start, end]);
+    return true;
+};
+
+/**
+ * Your MyCalendarTwo object will be instantiated and called as such:
+ * var obj = new MyCalendarTwo()
+ * var param_1 = obj.book(start,end)
+ */