关于这两个东西。哪里会有更详细的资料讲解？
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http://www.cnblogs.com/huoxingren/archive/2007/02/12/648648
http://www.cnblogs.com/gamix/archive/2006/06/08/420470
http://industry.ccidnet.com/art/1077/20040413/723119_1