相关链接：
http://www.jb51.net/article/37225.htm
http://www.cnblogs.com/mengdd/archive/2013/05/02/3055465.html
http://www.2cto.com/kf/201205/129964.html
http://yidongkaifa.iteye.com/blog/1788947
http://www.cnblogs.com/hanyonglu/archive/2012/03/01/2374894.html
原文：http://www.cnblogs.com/butterfly-clover/p/4701228.html