javascript jQuery 的 function($) (jQuery) 语法
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jQuery's function($) (jQuery) syntax
提问by mehdi
Possible Duplicate:
jQuery: What does (function($) {})(jQuery); mean?
I stumbled up on the following code (included in one file) but I just cannot understand what it really means.
我偶然发现了以下代码（包含在一个文件中），但我无法理解它的真正含义。
(function ($) {
function doSomething1(somedata) {
}
function doSomething1(somedata) {
}
})(jQuery);
Question 1: What does this syntax mean in the contex of jQuery
问题 1：这个语法在 jQuery 的上下文中意味着什么
Question 2: How can we call these functions let say from other files such as the HTML index file and other JavaScript files?
问题 2：我们如何从其他文件（例如 HTML 索引文件和其他 JavaScript 文件）中调用这些函数？
Thanks
谢谢
回答by Nikita Rybak
This syntax is not particularly special to jquery, it's normal javascript. Here simply function
这种语法对于 jquery 来说并不是特别特殊，它是普通的 javascript。这里只是功能
function ($) {
// some code here...
}
(note that it takes argument named $) is called with parameter jQuery(which is, obviously, global object of jQuery framework).
（请注意，它采用名为 的参数$）通过参数jQuery（显然，这是 jQuery 框架的全局对象）调用。
This is usually done when there're several js frameworks on one page (jquery, dojo, prototype, etc) which all redefine global variable $. But with this code, inside doSomething1or doSomething2you can always call $('.test')and be certain that call will be processed by jquery, not dojo. Because $is not a global variable in this case, it's function parameter.
这通常是在一个页面上有多个 js 框架（jquery、dojo、prototype 等）都重新定义全局变量时完成的$。但是使用此代码，在内部doSomething1或doSomething2您始终可以调用$('.test')并确定调用将由 jquery 处理，而不是由 dojo 处理。因为$在这种情况下不是全局变量，它是函数参数。
回答by Mantar
I'm not sure about your question here, but the (function() means it's self-executing,
我不确定你的问题，但 (function() 表示它是自动执行的，
and you call them by importing the files in the main page and then calling
然后通过导入主页中的文件然后调用它们来调用它们
doSomething1()
做某事1()
回答by ifaour
Mostly likely that was jQuery plugin: Plugins/Authoring
很可能是 jQuery 插件：Plugins/Authoring
