http://www.tuicool.com/articles/FvaIVj
http://www.cnblogs.com/tiandsp/archive/2012/10/22/2734552.html
http://blog.sina.com.cn/s/blog_5f5931540100qtsd.html
http://www.cnblogs.com/tiandsp/archive/2012/10/22/2734552.html
http://blog.sina.com.cn/s/blog_5f5931540100qtsd.html