http://blog.csdn.net/xiao_jun_0820/article/details/46831203
http://blog.csdn.net/xcockroach/article/details/37909343
http://blog.csdn.net/zhangketuan/article/details/46324461
http://chengjianxiaoxue.iteye.com/blog/2190488
原文：http://www.cnblogs.com/diyunpeng/p/5191989.html