奇怪的JavaScript语法是这样的:(function(){// code})();? [英] Strange JavaScript syntax like this: (function(){//code}) ();?
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问题描述
以下JavaScript代表什么意思?为什么函数里面嵌入()?
What does the below JavaScript mean? Why is the function embedded inside ()?
(function() {
var b = 3;
a += b;
}) ();
推荐答案
它的功能相当于执行下面的操作:
It's functionaly equivalent to doing something like:
var myFunc = function(){
var b = 3;
a += b;
};
myFunc();
它包含了圆括号(和尾部),以便函数立即被调用。正如其他人所说,这个概念被称为匿名功能。
It's got the parenthesis around it (and trailing) so that the function is called immediately. As others have said, the concept is called an anonymous function.
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