Flex封闭一个Alert对话框的方法：通过PopUpManager类的removePopUp()函数

Flex关闭一个Alert对话框的方法：通过PopUpManager类的removePopUp()函数
   Flex关闭一个Alert对话框的方法：在通常情况下，系统弹出的Alert对话框，是不需要特

意写一个关闭函数，但是若要是考虑更加熟悉应用PopUpManager类的removePopUp()函数，

这也不失为是一个好的锻炼方式：

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"         layout="vertical"         verticalAlign="middle"         backgroundColor="white">       <mx:Script>         <![CDATA[             import mx.controls.Alert;             import mx.managers.PopUpManager;               private var alert:Alert;               private function showAndHide(delay:Number):void {                 var alertText:String = "I'm an Alert control. I'll disappear in " + (delay / 1000).toFixed(1) + " seconds.";                 var alertTitle:String = "Timed Alert";                 alert = Alert.show(alertText, alertTitle);                 setTimeout(hideAlert, delay);             }               private function hideAlert():void {                 PopUpManager.removePopUp(alert);             }         ]]>     </mx:Script>       <mx:ApplicationControlBar dock="true">         <mx:Button label="Launch alert"                 click="showAndHide(3000);" />     </mx:ApplicationControlBar>   </mx:Application>