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node，setImmeidate, setTimeout, nextTick你真的了解么？ | hello2dj
source link: https://hello2dj.github.io/2018/01/10/node%E5%AE%9A%E6%97%B6%E5%99%A8%E7%9B%B8%E5%85%B3%E8%AF%A6%E8%A7%A3/?
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先来温习一下event loop中的几个phase可参见我的上篇文章libuv概览 timers: 这个phase是来检查定时器是否到期的，并执行的 poll(I/O): 这个是用来监听fd的事件的，比如socket的可读，可写，文件的可读可等 check: 当事件循环被I/O阻塞结束之后立刻调用check handle的回调。本质上他是和prepare phase(在循环被I/O阻塞之前（ri
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