事件优先级

<? xml version="1.0" encoding="utf-8" ?>
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"  layout ="absolute"  creationComplete ="initApp()" >
     < mx:Script >
         <![CDATA[
            import flash.events.MouseEvent;
            internal function initApp():void{
                btn.addEventListener(MouseEvent.CLICK,press_1,false,1);
                btn.addEventListener(MouseEvent.CLICK,press_2,false,4);
                btn.addEventListener(MouseEvent.CLICK,press_3,false,2);
            }
            internal function debug(str:String):void{
                area_txt.text += str+" ";  //注意这里是联加形式
            }
            internal function press():void{
                debug("press");
            }
            internal function press_1(event:MouseEvent):void{
                debug("press 1");
            }
            internal function press_2(event:MouseEvent):void{
                debug("press 2");
            }
            internal function press_3(event:MouseEvent):void{
                debug("press 3");
            }
         ]]>
     </ mx:Script >
     < mx:TextArea  x ="10"  y ="10"  height ="173"  id ="area_txt" />
     < mx:Button  x ="33"  y ="210"  label ="按钮"  id ="btn"  click ="press()" />
</ mx:Application >