(function(){})() 之间的区别；和函数(){}()； [英] Difference between (function(){})(); and function(){}();

问题描述

可能的重复:
是“(function ( ) { } ) ( )”和 “(function ( ) { } ( ) )”在 JavaScript 中功能相同?

这是我还没有完全弄清楚的事情，但我一直在使用 function(){}() 只是因为如果我添加括号，我的 VIM 语法高亮就会搞砸，尽管我已经看到 (function(){})() 出现了很多次，也许是 IE 的问题?

This is something I haven't quite figured out yet, but I have been using function(){}() just because my VIM syntax highlight screws up if I add the parenthesis, although I've seen (function(){})() around many times, maybe its an IE thing?

var singleton = function() {
    // code
}();

var singleton = (function() {
    // code
})();

推荐答案

Peter Michaux 讨论了 一对重要的父母.

Peter Michaux discusses the difference in An Important Pair of Parens.

基本上括号是一种约定，表示紧随其后的是立即调用的函数表达式，而不是普通函数.特别是如果函数体很长，这会减少惊喜，

Basically the parentheses are a convention to denote that an immediately invoked function expression is following, not a plain function. Especially if the function body is lengthy, this reduces surprises,

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