jQuery .hasClass()与.is() [英] jQuery .hasClass() vs .is()

问题描述

从性能的角度来看，是否存在确定元素是否被分配类的首选方法?

is there a preferred method of determining whether an element is assigned a class, from a performance standpoint?

$('#foo').hasClass('bar');

或

$('#foo').is('.bar');

推荐答案

更新:

我在发表评论后进行了一项测试，并进行了四次投票.事实证明，我所说的是正确的答案.结果如下:

Update:

I committed a test following a comment and four upvotes to very comment. It turns out that what I had said is the correct answer. Here is the result:

http://jsperf.com/hasclass-vs-is-so

is 是多用途的，例如，您可以执行is('.class')，is(':checked')，以此类推，这意味着is还有很多要做的事情，其中 hasClass 是受限制的，它仅检查是否设置了一个类.

The is is multi-purpose, you can for example do is('.class'), is(':checked'), etc which means is has more to do where is hasClass is limited which only checks for a class being set or not.

因此，hasClass应该优先考虑任何级别的性能.

Hence, hasClass should be faster if performance at any level is your priority.

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