http://blog.163.com/jany_1016/blog/static/4604400620091112114127341/
http://blog.csdn.net/yuebinghaoyuan/article/details/8570160
http://www.cnblogs.com/liupeizhi/category/281132.html
http://www.cnblogs.com/edwardlauxh/default.html?page=9
原文：http://www.cnblogs.com/stono/p/4599176.html