//载入图形var c:Class = getDefinitionByName(bmpname) as Class;var b:BitmapData = new c(0, 0) as BitmapData;var img:Bitmap = new Bitmap(b);trace(img);addChild(img);人家都说这种方法能由一个实例得到类,我能用这种方法由一个ButtonName:String得到这个Button对象吗?强制转化不好使啊