Shulou(Shulou.com)06/01 Report--

This article mainly introduces jQuery how to judge the existence of elements, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Determine whether the element exists or not

$(document) .ready (function () {if ($("# xy") .length) {alert ("element exists");} else {alert ("element does not exist") Jquery is what jquery is a simple and fast JavaScript library, it has a unique chain syntax and short and clear multi-function interface, efficient and flexible css selector, and can be extended to CSS selector, with convenient plug-in extension mechanism and rich plug-ins, after Prototype is another excellent JavaScript code base, can be used to simplify event processing, HTML document traversal, Ajax interaction and animation, in order to quickly develop the website.

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