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http://my.oschina.net/u/1177710/blog/284608

http://chuhanzhi.com/?p=45

http://www.2cto.com/kf/201501/374056.html

http://snailxr.iteye.com/blog/2076903

http://sundoctor.iteye.com/blog/399980?page=3

http://www.tuicool.com/articles/jmU7bq