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性能，理发师的例子分享：

http://www.cnblogs.com/jackei/archive/2006/11/20/565527.html

http://www.cnblogs.com/jackei/archive/2006/12/12/589473.html    10.23

http://www.cnblogs.com/fnng/archive/2012/08/17/2644878.html   -虫师博客分享

https://wenku.baidu.com/view/f8bfcf0b6c85ec3a87c2c590.html 具体性能测试案例