http://blog.csdn.net/ye1992/article/details/25286539
http://www.jb51.net/article/43727.htm
http://blog.sina.com.cn/s/blog_4540c3630100aq01.html
http://www.docin.com/p-752071560.html
http://blog.chinaunix.net/uid-12348673-id-3335307.html
原文：http://www.cnblogs.com/butterfly-clover/p/4851589.html