jQuery 是一个 Javascr ipt 库。
jQuery 极大地简化了 Javascr ipt 编程。(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.)