· 收录于 当前文章被以下社区和专栏收录： 本文深入解析JavaScript事件循环（Event Loop）机制，阐明其作为单线程异步调度核心的工作原理：同步任务优先执行，随后清空微任务队列，再执行一个宏任务，循环往复。

JavaScript 的 事件循环 （Event Loop）是它实现异步非阻塞操作的核心 机制。 即使 JavaScript 是单线程的（一次只能做一件事）， 事件循环 也能让它处理定时器、网络请求、用户点击等并发 任务。

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