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什么是事件循环？Node事件循环和JS事件循环的差异是什么？ #27

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YvetteLau opened this issue Apr 21, 2019 · 2 comments
Open

什么是事件循环？Node事件循环和JS事件循环的差异是什么？ #27

YvetteLau opened this issue Apr 21, 2019 · 2 comments

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@YvetteLau
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@YvetteLau YvetteLau mentioned this issue Apr 22, 2019
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@coderzym
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我也不懂。。。我还是小白

@coderzym
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现在懂了一点，稍微讲下。JS是单线程的，为了防止一个函数执行时间过长阻塞后面的代码，所以会先将同步代码压入执行栈中，依次执行，将异步代码推入异步队列，异步队列又分为宏任务队列和微任务队列，因为宏任务队列的执行时间较长，所以微任务队列要优先于宏任务队列。微任务队列的代表就是，Promise.then，MutationObserver，宏任务的话就是setImmediate setTimeout setInterval，欢迎大佬们补充

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@YvetteLau @coderzym