jQuery是一个快速、简洁的Javascr ipt框架，是继Prototype之后又一个优秀的Javascr ipt代码库（或Javascr ipt框架）(jQuery is a fast, small, and feature-rich Javascr ipt library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write Javascr ipt.)