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 。)
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