关于闭包的文章

http://my.oschina.net/sulliy/blog/64878

http://www.ibm.com/developerworks/cn/linux/l-cn-closure/

http://www.cnblogs.com/Jifangliang/archive/2008/08/05/1260602.html

http://www.cnblogs.com/perhaps/archive/2010/05/03/1726442.html

http://www.cnblogs.com/egametang/archive/2012/04/23/2466728.html