使用ajax时，由于不刷新页面，无法记录浏览历史，这个程序源码演示了如何避免这一情况。-When using ajax, because they do not refresh the page can not be recorded browsing history, the program source code demonstrates how to avoid this situation.

异步操作，html利用History返回，进行操控，达到无刷返回效果。(Asynchronous operation, HTML use History return, manipulation, to achieve the effect of brushless returns.)