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https://www.cnblogs.com/itmacy/p/6958181.html

https://www.cnblogs.com/pigtail/archive/2013/01/24/2875310.html

http://blog.csdn.net/joyhen/article/details/21631833

https://www.cnblogs.com/pigtail/archive/2013/01/24/2875310.html