http://blog.csdn.net/blue_jjw/article/details/8741000
http://blog.chinaunix.net/uid-23390992-id-3480474.html
http://bbs.chinaunix.net/thread-1793446-1-1.html
http://zengyouyuan.iteye.com/blog/1923974
原文：http://www.cnblogs.com/diyunpeng/p/3518556.html