flex事件优先级设置

<?xml version="1.0"?>
<!-- events/ShowEventPriorities.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="initApp()">
    <mx:Script><![CDATA[
        private function returnResult(e:Event):void {
            ta1.text += "returnResult() method called last (priority 1)\n";  
        }

        private function verifyInputData(e:Event):void {
            ta1.text += "verifyInputData() method called first (priority 3)\n";  
        }

        private function saveInputData(e:Event):void {
            ta1.text += "saveInputData() method called second (priority 2)\n";  
        }

        private function initApp():void {
            b1.addEventListener(MouseEvent.CLICK, returnResult, false, 1);
            b1.addEventListener(MouseEvent.CLICK, saveInputData, false, 2);
            b1.addEventListener(MouseEvent.CLICK, verifyInputData, false, 3);
        }
    ]]></mx:Script>

    <mx:Button id="b1" label="Click Me"/>
    
    <mx:TextArea id="ta1" height="200" width="300"/>
    
</mx:Application>

 

b1.addEventListener(MouseEvent.CLICK, returnResult, false, 1);
这里的第三个参数是事件的优先级，这里表示鼠标点击会有三个事件来响应，响应的顺序根据第三个参数设定，越高越先执行，这里点击后三个事件的执行顺序为verifyInputData，saveInputData，returnResult