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JavaScript Hoisting(提升) | 会飞的菜虫 #25

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FlyingCaiChong opened this issue Dec 27, 2023 · 0 comments
Open

JavaScript Hoisting(提升) | 会飞的菜虫 #25

FlyingCaiChong opened this issue Dec 27, 2023 · 0 comments
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@FlyingCaiChong
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http://flyingcc.cn/2023/12/27/javascript-hoisting/

什么是 Hoisting?在编译阶段,就在代码执行前几微秒, 会扫描查找函数和变量声明. 所有这些函数和变量声明都被添加到称为词法环境(Lexical Environment)的数据结构的内存中. 这样即使在源代码声明它们之前, 也可以使用它们. 什么是词法环境?词法环境是一个包含identifier-variable映射的结构(这里的identifier是指变量或函数的名称, variable是
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