uploadify 上传控件的demo
参考资料：
http://www.cnblogs.com/insus/p/3590907.html
http://www.cnblogs.com/wuhuacong/archive/2012/12/01/2797679.html
http://www.cnblogs.com/wuhuacong/p/3343967.html
http://www.cnblogs.com/wolf-sun/p/3565184.html
http://www.cnblogs.com/wolf-sun/p/3266151.html