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http://www.phperz.com/article/14/0615/95.html
http://www.kuqin.com/shuoit/20141101/342963.html
http://www.tuicool.com/articles/r6fuem
http://my.oschina.net/melonol/blog/127441?fromerr=7LXJYXpb
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原文地址：http://www.cnblogs.com/chen5421/p/5622091.html
