From cf628007c85fa45f69dc8970aa106d995d515ea3 Mon Sep 17 00:00:00 2001
From: S-N-O-R-L-A-X <10195101536@stu.ecnu.edu.cn>
Date: Sat, 3 Dec 2022 23:00:13 +0800
Subject: [PATCH] Update stack.md

add javascript and typescript for stack
---
 docs/chapter_stack_and_queue/stack.md | 42 +++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/docs/chapter_stack_and_queue/stack.md b/docs/chapter_stack_and_queue/stack.md
index 80870a078..317bfe66b 100644
--- a/docs/chapter_stack_and_queue/stack.md
+++ b/docs/chapter_stack_and_queue/stack.md
@@ -143,13 +143,55 @@ comments: true
 === "JavaScript"
 
     ```js title="stack.js"
+    /* 初始化栈 */
+    // Javascript 没有内置的栈类，可以把 Array 当作栈来使用 
+    const stack = [];
 
+    /* 元素入栈 */
+    stack.push(1);
+    stack.push(3);
+    stack.push(2);
+    stack.push(5);
+    stack.push(4);
+
+    /* 访问栈顶元素 */
+    peek = stack[stack.length-1];
+
+    /* 元素出栈 */
+    pop = stack.pop();
+
+    /* 获取栈的长度 */
+    size = stack.length;
+
+    /* 判断是否为空 */
+    is_empty = stack.length === 0;
     ```
 
 === "TypeScript"
 
     ```typescript title="stack.ts"
+    /* 初始化栈 */
+    // Typescript 没有内置的栈类，可以把 Array 当作栈来使用 
+    const stack:number[] = [];
 
+    /* 元素入栈 */
+    stack.push(1);
+    stack.push(3);
+    stack.push(2);
+    stack.push(5);
+    stack.push(4);
+
+    /* 访问栈顶元素 */
+    peek = stack[stack.length-1];
+
+    /* 元素出栈 */
+    pop = stack.pop();
+
+    /* 获取栈的长度 */
+    size = stack.length;
+
+    /* 判断是否为空 */
+    is_empty = stack.length === 0;
     ```
 
 === "C"