> For the complete documentation index, see [llms.txt](https://mm.ricky.moe/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mm.ricky.moe/algorithm/algorithm-and-data-structure/dui-lie/dui-lie-mo-fang-zhan.md).

# 队列模仿栈

使用队列实现栈的下列操作：

* push(x) -- 元素 x 入栈 
* pop() -- 移除栈顶元素 
* top() -- 获取栈顶元素 
* empty() -- 返回栈是否为空

```javascript
/**
 * Initialize your data structure here.
 */
var MyStack = function() {
    this.list = [];
    this.topEl = null;
};

/**
 * Push element x onto stack. 
 * @param {number} x
 * @return {void}
 */
MyStack.prototype.push = function(x) {
    this.list.push(x);
    this.topEl = x;
};

/**
 * Removes the element on top of the stack and returns that element.
 * @return {number}
 */
MyStack.prototype.pop = function() {
    let temp = [];
    while(this.list.length > 1) {
            let s = this.list.shift();
            temp.push(s);
            this.topEl = s;
    }
    let topEl = this.list.shift();
    this.list = temp;
    return topEl;
};

/**
 * Get the top element.
 * @return {number}
 */
MyStack.prototype.top = function() {
    return this.topEl
};

/**
 * Returns whether the stack is empty.
 * @return {boolean}
 */
MyStack.prototype.empty = function() {
    return this.list.length === 0
};

作者：egerton
链接：https://leetcode-cn.com/problems/implement-stack-using-queues/solution/gen-ju-guan-fang-ti-jie-xie-de-javascriptshi-xian-/
来源：力扣（LeetCode）
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://mm.ricky.moe/algorithm/algorithm-and-data-structure/dui-lie/dui-lie-mo-fang-zhan.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.