前端工程师JavaScript作用域的相关内容

文章 2018-05-17 来自：开发者社区

【前端工程师手册】JavaScript作用域拾遗

【前端工程师手册】JavaScript作用域拾遗昨天总结了一些作用域的知识【前端工程师手册】JavaScript之作用域，但是发表完发现忘记了一些东西，今天拾个遗。昨天说到了JavaScript中没有块级作用域，其实在es6中是有的。 es6中的块级作用域先举个栗子： var foo = true; if (foo) { let bar = foo * 2; bar = ...

文章 2018-05-17 来自：开发者社区

【前端工程师手册】JavaScript之作用域

【前端工程师手册】JavaScript之作用域什么是作用域来一段《你不知道的JavaScript-上卷》中的原话：几乎所有编程语言最基本的功能之一，就是能够储存变量当中的值，并且能在之后对这个值进行访问或修改，这些变量住在哪里?换句话说，它们储存在哪里?最重要的是，程序需要时如何找到它们?这些问题说明需要一套设计良好的规则来存储变量，并且之后可以方便地找到这些变量。这套规则被称为作用...

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