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面试题目总结。 #1

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gjqiang opened this issue Mar 26, 2019 · 0 comments
Open

面试题目总结。 #1

gjqiang opened this issue Mar 26, 2019 · 0 comments

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@gjqiang
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gjqiang commented Mar 26, 2019 •
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f();  // hehe;
function f(){
    alert("hehe");
}

上下文代码执行时有两个阶段，
1、进入上下文 2、执行代码

进入上下文之时 VO 里包含三种属性，
1.形参，值未传入的值，或undefined
2.函数声明，值为function
3.变量声明，值为undefined

函数声明可以覆盖同名属性（即同名形参、变量），变量声明不能干扰形参、函数声明。

在代码执行阶段 VO 才会改变

http://www.cnblogs.com/TomXu/archive/2012/01/16/2309728.html#!comments
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