在jQuery糟糕的做法中使用$（）快捷方式？-isusingthe$()shortcutinjQuerybadpractice?

21  

No, it's not bad practice, and there is no performance difference.

不，这不是不好的做法，并没有性能差异。

The $ and jQuery identifiers refer to the same function instance.
This is done by the last line of jQuery.js:

$和jQuery标识符引用相同的函数实例。这是由jQuery.js的最后一行完成的：

window.jQuery = window.$ = jQuery;

12  

The only problem with using $() over jQuery() is the possibility that another Javascript framework uses it as well.

使用$（）而不是jQuery（）的唯一问题是另一个Javascript框架也可能使用它。

4  

Nope - take a look at the jQuery source code. $ is just another alias for jQuery - the last line says it all:

不 - 看看jQuery源代码。 $只是jQuery的另一个别名 - 最后一行说明了一切：

window.jQuery = window.$ = jQuery;

See here for yourself: http://code.jquery.com/jquery-latest.js

请看这里：http：//code.jquery.com/jquery-latest.js

2  

To me, the goal is to avoid naming collision with other libraries that also use $ as main object, like Prototype, if you want to use both libraries on the same page, or you don't know where your code will be used...

对我来说，目标是避免命名与其他使用$作为主要对象的库的命名冲突，如Prototype，如果你想在同一页面上使用这两个库，或者你不知道你的代码将被用在哪里。 。

2  

Are you sure it was $() vs jQuery()? Maybe the more salient point is that there are performance hits to doing either, and many new js coders use $() unnecessarily when plain js could do.

你确定它是$（）vs jQuery（）吗？也许更突出的一点就是有性能命中要么做，而且许多新的js编码器在普通的js可以做的时候不必要地使用$（）。

It's good practice to avoid creating a jQuery object when you don't have to.

最好避免在不必要时创建jQuery对象。

0  

As stated before, the only real problem is getting into conflict with other js frameworks used, therefore i find this is the most handy solution to be still able to use the dollar sign, but have no conflicts and make your code more portable:

如前所述，唯一真正的问题是与使用的其他js框架发生冲突，因此我发现这是仍然能够使用美元符号的最方便的解决方案，但没有冲突并使您的代码更具可移植性：

(function($) { /* some code that uses $ */ })(jQuery)

http://docs.jquery.com/Using_jQuery_with_Other_Libraries#Referencing_Magic_-_Shortcuts_for_jQuery

http://docs.jquery.com/Using_jQuery_with_Other_Libraries#Referencing_Magic_-_Shortcuts_for_jQuery