javascript - “ javascript：void（0）”是什么意思？(What does “javascript:void(0)” mean?)

Question

<a href="javascript:void(0)" id="loginlink">login</a>

我已经看过很多次href ，但是我不知道这到底意味着什么。

  ask by omg translate from so

Answer 1

The void operator evaluates the given expression and then returns undefined .

(void运算符计算给定的表达式，然后返回undefined 。)

The void operator is often used merely to obtain the undefined primitive value, usually using “ void(0) ” (which is equivalent to “ void 0 ”).

(void运算符通常仅用于获取undefined原始值，通常使用“ void(0) ”（等效于“ void 0 ”）。)

In these cases, the global variable undefined can be used instead (assuming it has not been assigned to a non-default value).

(在这些情况下，可以改用undefined全局变量（假设尚未将其分配给非默认值）。)

An explanation is provided here: void operator .

(这里提供了一个解释： void operator 。)

The reason you'd want to do this with the href of a link is that normally, a javascript: URL will redirect the browser to a plain text version of the result of evaluating that JavaScript.

(您之所以要使用链接的href这样做是因为，通常，一个javascript: URL会将浏览器重定向到评估该JavaScript的纯文本版本。)

But if the result is undefined , then the browser stays on the same page.

(但是，如果结果undefined ，则浏览器将停留在同一页面上。)

void(0) is just a short and simple script that evaluates to undefined .

(void(0)只是一个简短的脚本，其结果为undefined 。)