as3 flash 参数获得(root.loaderInfo.parameters 用法)
http://vsheyan.blogbus.com/logs/46456208.html
[How to] FlashVars in AS3
http://www.kirupa.com/forum/archive/index.php/t-263791.html
http://stackoverflow.com/questions/6057211/loaderinfo-parameters-in-as3