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为何你始终理解不了JavaScript作用域链?

 4 years ago
source link: https://juejin.im/post/5c8efeb1e51d45614372addd
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前言 掘金上关于作用域和作用域链的讨论非常多,但少有人来讲清楚JS中相关的机制,这里我就捡一些大佬们看剩的知识,来讲讲理解作用域之前的准备。 带着这些问题看文章: JavaScript 是如何编译执行的? 查找作用域时是如何一层层往上查询的? JavaScr

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