出错的可以参考我的博客，希望对你们有用吧
http://blog.csdn.net/erlian1992/article/details/50540769
http://blog.csdn.net/erlian1992/article/details/50542154
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http://blog.csdn.net/erlian1992/article/details/50540769
http://blog.csdn.net/erlian1992/article/details/50542154
2016-01-19
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