http://blog.163.com/longsu2010@yeah/blog/static/173612348201202114212933/
http://blog.youkuaiyun.com/patdz/article/details/7669591
http://blog.163.com/longsu2010@yeah/blog/static/173612348201202114212933/
http://blog.youkuaiyun.com/patdz/article/details/7669591