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>