函数($)在javascript中的含义是什么? [英] What does function($) mean in javascript?
问题描述
我意识到$只是命名指向jQuery对象的变量的约定,也是document.getElementById()的函数,但函数($)是否意味着什么?
I realize that the $ is just sort of a convention for naming variables pointing to jQuery objects, and is also the function for document.getElementById(), but does function($) mean anything?
编辑:我的意思是
(function($) {
/* ... */
})(jQuery);
对于困惑感到抱歉,但感谢您的答案。
Sorry for the confusion, but thanks for the answers.
推荐答案
有些代码使用$表示jQuery(或其他库)来保持全局范围的清洁。默认情况下,jQuery在全局范围内接管$,但是,如果扩展并且不能使用全局$,它可以保持范围干净,同时帮助jQuery与其他库一起工作。
Some code uses $ for jQuery (or other libraries) to keep the global scope clean. By default, jQuery takes over $ in the global scope, however, if extensions and whatnot avoid using the global $, it can keep the scope clean, along with helping jQuery work with other libraries.
(function ($) {
//$ is now a jquery instance
})(jQuery);
基本上,这是一种使用jQuery对象即时执行代码的方法,而不依赖于全局级别的函数变量。 (也可以用它来创建闭包......但是在这种情况下,这是相同的想法。)
Basically it's a way to instantly execute code with a jQuery object without the function depending on a global-level variable. (Closures can also be created with it... But that's the same idea [in this situation].)
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