kan

http://blog.csdn.net/yahohi/article/details/7427724

 

http://duanhengbin.iteye.com/blog/1706635

 

http://www.cnblogs.com/kaituorensheng/archive/2012/10/23/2736069.html

 

http://blog.csdn.net/lovemysea/article/details/5275612