http://www.cnblogs.com/xiaoxi/p/5942805.html
http://www.cnblogs.com/dukou/p/4691543.html
http://blog.csdn.net/xiaodingdou/article/details/53286503?_t_t_t=0.9440201732795686
http://blog.csdn.net/moyanxuan_1993_2_24/article/details/52790314
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