1. http://blog.csdn.net/myarrow/article/details/8129607/

2.  http://blog.csdn.net/liuhaomatou/article/details/40398753

3.  http://www.cnblogs.com/snake-hand/p/3174650.html
4. http://blog.csdn.net/u011913612/article/details/52785722

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