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一次弄懂Event Loop（彻底解决此类面试问题）
source link: https://juejin.im/post/5c3d8956e51d4511dc72c200
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前言 Event Loop即事件循环，是指浏览器或Node的一种解决javaScript单线程运行时不会阻塞的一种机制，也就是我们经常使用异步的原理。 为啥要弄懂Event Loop 是要增加自己技术的深度，也就是懂得JavaScript的运行机制。
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