http://blog.csdn.net/u010661782/article/details/50749271
http://blog.csdn.net/qq_35071078/article/details/73065046
http://www.cnblogs.com/zjutlitao/p/4231635.html
http://blog.csdn.net/ever_gz/article/details/49669729
http://blog.csdn.net/u010661782/article/details/50749080
http://blog.csdn.net/mad1989/article/details/9970431
