jQuery 有“存在”函数吗？ - Is there an "exists" function for jQuery?

问题：

How can I check the existence of an element in jQuery?如何检查jQuery中元素的存在？

The current code that I have is this:我目前的代码是这样的：

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

Is there a more elegant way to approach this?有没有更优雅的方法来解决这个问题？ Perhaps a plugin or a function?也许是插件或功能？

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解决方案：

参考一： https://en.stackoom.com/question/84i参考二： https://stackoom.com/question/84i