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