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第三十七题：void 0 #37

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Ray-56 opened this issue Oct 9, 2019 · 1 comment
Open

第三十七题：void 0 #37

Ray-56 opened this issue Oct 9, 2019 · 1 comment
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JavaScript 解释型编程语言

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@Ray-56
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Ray-56 commented Oct 9, 2019

void 0 表示什么
@Ray-56 Ray-56 added the JavaScript 解释型编程语言 label Oct 9, 2019
@MMmaXingXing
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void 0 == undefined

介绍

在js中，void的作用是对给定的表达式赋值，并且返回undefined

为什么用void 0

void 0 是表达式中最短的。用 void 0 代替 undefined 能节省字节。并且在es5中 undifind可能在局部被重写。

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@Ray-56 @MMmaXingXing