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图解搞懂JavaScript引擎Event Loop
source link: https://juejin.im/post/5a6309f76fb9a01cab2858b1
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一，js单线程存在的问题 js是单线程的，处理任务是一件接着一件处理，所以如果一个任务需要处理很久的话，后面的任务就会被阻塞 所以js通过Event Loop事件循环的方式解决了这个问题,在了解事件循环前，我们需要了解一些关键词 二,什么是stack，queu
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