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从event loop到async await来了解事件循环机制
source link: https://juejin.im/post/5c148ec8e51d4576e83fd836
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JS为什么是单线程的? 最初设计JS是用来在浏览器验证表单操控DOM元素的是一门脚本语言，如果js是多线程的那么两个线程同时对一个DOM元素进行了相互冲突的操作，那么浏览器的解析器是无法执行的。 JS为什么需要异步? 如果JS中不存在异步，只能自上而下执行，如
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