参考:http://www.jianshu.com/p/a172a1b69fdd

http://www.jianshu.com/p/1ae0ef652f63

http://www.jb51.net/article/76110.htm

http://www.tangshuang.net/2359.html

http://wyong.blog.51cto.com/1115465/1692322

常见问题http://kf.qq.com/faq/140225MveaUz150413VNj6nm.html

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