jQuery 是一个快速的，简洁的 javascr ipt 库，使用户能更方便地处理 HTML documents、events、实现动画效果，并且方便地为网站提供 AJAX 交互。 jQuery 还有一个比较大的优势是，它的文档说明很全，而且各种应用也说得很详细，同时还有许多成熟的插件可供选择。 jQuery 能够使用户的 html 页保持代码和 html 内容分离，也就是说，不用再在 html 里面插入一堆js来调用命令了，只需定义 id 即可。 -jQuery is a fast, simple javascr ipt libraries, allowing users to more easily deal with HTML documents, events, to achieve animation effects, and to facilitate interaction for AJAX web site. jQuery also has a relatively large advantage is that it' s documentation is very full, but a variety of applications has made it very detailed, along with many mature plug-ins to choose from. jQuery enables users to keep the html page code and html content separation, that is, no longer inserted inside a bunch of js in the html to call the command, and only the definition of id can be.