MOUSE_OVER/MOUSE_OUT与ROLL_OVER/ROLL_OUT的区别

MOUSE_OVER和MOUSE_OUT除了对监听该事件的控件作出响应，同时也对该控件的所有子控件(拥有该事件)进行响应

ROLL_OVER和ROLL_OUT则相反，只响应监听该事件的控件

Code

package
{
    import flash.display.Sprite;
    import flash.display.StageScaleMode;
    import flash.events.MouseEvent;
    
     public  class Sample0814 extends Sprite
    {
         public function Sample0814()
        {
            stage.scaleMode = StageScaleMode.NO_SCALE;
            
             var box:Sprite =  new Sprite();
            box.graphics.beginFill( 0xCCCCCC);
            box.graphics.drawRect( 0, 0, 200, 200);
            box.graphics.endFill();
            box.x = box.y =  50;
//           box.addEventListener(MouseEvent.MOUSE_OVER,mouseOverHandler);
//           box.addEventListener(MouseEvent.MOUSE_OUT,mouseOutHandler);
            box.addEventListener(MouseEvent.ROLL_OVER,rollOverHandler);
            box.addEventListener(MouseEvent.ROLL_OUT,rollOutHandler);
             this.addChild(box);
            
             var item:Sprite =  new Sprite();
            item.graphics.beginFill( 0xFF0000);
            item.graphics.drawRect( 0, 0, 80, 80);
            item.graphics.endFill();
            item.x = item.y =  60;
            box.addChild(item);
        }
        
         private function mouseOverHandler( event:MouseEvent): void
        {
            trace( " mouse over ");
        }
        
         private function mouseOutHandler( event:MouseEvent): void
        {
            trace( " mouse out ");
        }
        
         private function rollOverHandler( event:MouseEvent): void
        {
            trace( " roll over ");
        }
        
         private function rollOutHandler( event:MouseEvent): void
        {
            trace( " roll out ");
        }
    }
}