在 30-seconds-of-code 仓库的 JavaScript 片段集中， event-driven-vanilla-js-signals.md 展示了如何 不依赖任何框架 ，仅用原生 EventTarget 、 CustomEvent 与类私有字段，在不到 70 行代码内实现现代前端响应式编程中最核心的三个概念： Signal（信号） 、 Effect（副作用） 与 ...

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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