http://chigooo.iteye.com/blog/1703084
http://www.iteye.com/topic/1118082
http://donald3003a.iteye.com/blog/1701304
http://blog.csdn.net/wugouzi/article/details/25044655
1-4
http://suo.iteye.com/blog/1233621
原文：http://www.cnblogs.com/sj521/p/5387396.html