有没有“存在"?jQuery的功能? [英] Is there an "exists" function for jQuery?

问题描述

How can I check the existence of an element in jQuery?

The current code that I have is this:

if ($(selector).length > 0) {
    // Do something
}

Is there a more elegant way to approach this? Perhaps a plugin or a function?

解决方案

In JavaScript, everything is 'truthy' or 'falsy', and for numbers 0 means false, everything else true. So you could write:

if ($(selector).length)

You don't need that >0 part.

这篇关于有没有“存在"?jQuery的功能?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！