http://blog.youkuaiyun.com/kittyjie/article/details/4386742
http://blog.youkuaiyun.com/szkbsgy/article/details/6420113
http://www.cnblogs.com/YOUEN/archive/2012/02/02/2336115.html
http://blog.youkuaiyun.com/njzhiyuan/article/details/4369588
http://blog.youkuaiyun.com/xufei96/article/details/5984647