对于 jQuery 是否有一个"存在的"函数？

Question

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?

转载于:https://stackoverflow.com/questions/31044/is-there-an-exists-function-for-jquery

Answer 1

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

if ($(selector).length)

You don't need that >0 part.