jQuery新手:jQuery(function($){...})是什么意思? [英] jQuery newbie: what does jQuery(function($) { ... }) means?

问题描述

我知道在jQuery中，$(callback)与jQuery(callback)相同，与$(document).ready()具有相同的效果.

I know in jQuery, $(callback) is the same as jQuery(callback) which has the same effect as $(document).ready().

怎么样

jQuery(function($) {

 });

有人可以向我解释这种功能是什么意思吗?

Can some one explain to me what does this kind of function mean?

它是做什么的?

这和$(callback) ??

这个和$(function()) ??有什么区别?

what is the difference between this one and $(function())??

推荐答案

jQuery(function($) {

});

是这三个版本中最安全的版本.它使$成为局部变量，从而优雅地避免了与可能使用$符号的任何其他变量的冲突.

is the safest version of all three. It makes $ the local variable and thus gracefully avoids the conflicts with any other variables which possibly use $ symbol.

我认为它也是最近才添加的，不记得之前看到过.

I think it was also added fairly recently, don't remember seeing it before.

这些功能都做同样的事情-在DOM准备就绪时执行一些代码. $(document).ready(function(){})是原始版本，它与基础javascript API匹配.

These function all do the same things - execute some code when DOM is ready. $(document).ready(function(){}) is the original one, and it matches the underlying javascript API.

"$"和"jQuery"被创建为快捷方式，以避免重复这种常见的构造.接受一个接受$作为其第一个参数的函数是另一个语法糖-现在您可以方便地进行闭包操作，而无需自己执行.

"$" and "jQuery" which accept function as an arguments were created as shortcuts to avoid repeating such a common construct. Accepting a function which accepts $ as its first argument is a further syntax sugar - now you get convenience of the closures without the need to do it yourself.

这篇关于jQuery新手:jQuery(function($){...})是什么意思?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！