添加232.用栈实现队列JavaScript版本

problems/0232.用栈实现队列.md

@@ -353,6 +353,61 @@ func (this *MyQueue) Empty() bool {
  */
  ```
 
+ javaScript:
+
+ ```js
+ // 使用两个数组的栈方法（push, pop） 实现队列
+ /**
+ * Initialize your data structure here.
+ */
+var MyQueue = function() {
+    this.stack1 = [];
+    this.stack2 = [];
+};
+
+/**
+ * Push element x to the back of queue. 
+ * @param {number} x
+ * @return {void}
+ */
+MyQueue.prototype.push = function(x) {
+    this.stack1.push(x);
+};
+
+/**
+ * Removes the element from in front of queue and returns that element.
+ * @return {number}
+ */
+MyQueue.prototype.pop = function() {
+    const size = this.stack2.length;
+    if(size) {
+        return this.stack2.pop();
+    }
+    while(this.stack1.length) {
+        this.stack2.push(this.stack1.pop());
+    }
+    return this.stack2.pop();
+};
+
+/**
+ * Get the front element.
+ * @return {number}
+ */
+MyQueue.prototype.peek = function() {
+    const x = this.pop();
+    this.stack2.push(x);
+    return x;
+};
+
+/**
+ * Returns whether the queue is empty.
+ * @return {boolean}
+ */
+MyQueue.prototype.empty = function() {
+    return !this.stack1.length && !this.stack2.length
+};
+ ```
+