事件循环是JavaScript运行时调度任务的核心机制，它决定了代码的执行顺序与响应时机。原生alert本质上是同步阻塞调用，一旦触发，会暂停主线程一切任务，包括定时器回调、Promise以及渲染合成，导致页面进入“假活”状态。理解这一原理后，开发者才能真正跳出“改样式”的误区，转向用自定义 ...

本内容遵循CC 4.0 BY-SA版权协议 迭代器（Iterator）是一种设计模式，它提供了一种顺序访问聚合对象中各个元素的方法，而不需要暴露该对象的内部表示。在编程语言中，迭代器通常表现为一个对象，它知道如何一次访问一个集合中的项目，同时跟踪当前的位置。

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