http://v.youku.com/v_show/id_XNjYyNTkyOTIw.html?from=y1.2-1-87.3.3-1.1-1-1-2
http://v.youku.com/v_show/id_XNjYyNTg3NjQw.h
http://jingyan.baidu.com/article/6d704a13db463828db51ca12.html
1.18
原文：http://www.cnblogs.com/zhangbo123/p/4232265.html
