.live（）的回答你的问题：

http://api.jquery.com/live/

从文档：

的.live（）方法能够影响尚未被元件   处理程序绑定：通过使用事件代表团加入到DOM   祖代元素负责所触发的事件   它的后代。传递给.live处理程序（）永远不会绑定到一个   元件;相反，.live（）绑定一个特殊的处理程序的根   DOM树。

The .live() method is able to affect elements that have not yet been added to the DOM through the use of event delegation: a handler bound to an ancestor element is responsible for events that are triggered on its descendants. The handler passed to .live() is never bound to an element; instead, .live() binds a special handler to the root of the DOM tree.