由于这里只需要栈的 push () 与 pop () 两个操作，直接用 JavaScript 数组模拟即可，无需引入自定义栈类。 如果你希望系统性地了解栈及其在 JavaScript 中的经典实现，可以参考仓库中的 Stack 数据结构一文 ——它同样位于本仓库，详细讲解了 push 、 pop 、 peek 、 isEmpty 四个基本操作的实现原理。

数组的 Array.prototype.forEach() 虽然方便，但默认只能从左向右遍历。当需要倒序处理数组元素时，常见的思路是使用 for 循环，但更优雅的做法是利用 Array.prototype.slice()、Array.prototype.reverse() 与 Array.prototype.forEach() 的组合，一步完成“不修改原数组的逆序遍历”。

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