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参考：
http://blog.csdn.net/evkj2013/article/details/10186199
http://www.cnblogs.com/xianyunhe/archive/2011/09/25/2190485.html
http://blog.csdn.net/chumoyangguang/article/details/8872944
http://retype.wenku.baidu.com/view/e9b4e3edb8f67c1cfad6b860.html
http://blog.csdn.net/fullsail/article/details/4067416
http://wenku.baidu.com/view/f233445dbe23482fb4da4cf7.html
http://www.cnblogs.com/tgyf/p/3735001.html
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原文地址：http://www.cnblogs.com/iluzhiyong/p/4295371.html
