flex里键盘事件

一、

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
      addedToStage="stage.addEventListener(KeyboardEvent.KEY_DOWN, myKeyDown)"  
     click="clickEvt(event)"
     layout="absolute"
     frameRate="6"
     creationComplete="start()" keyFocusChange="testKey(event)"   
  backgroundGradientAlphas="[1.0, 1.0]" backgroundGradientColors="[#990000, #FF9900]">
<mx:Script source="SnakeMain.as"/>

二、<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                layout="absolute"
                applicationComplete="appComplete();"> 
    <mx:Script> 
       <![CDATA[ 
           import mx.controls.Alert; 
            import flash.events.KeyboardEvent; 
             
            //监听keyboard事件 
            private function appComplete():void 
            { 
                 this.addEventListener(KeyboardEvent.KEY_DOWN,keyHandler);
                //this.addEventListener(KeyboardEvent.KEY_UP, myKeyUp); 
                //this.addEventListener(KeyboardEvent.KEY_DOWN, myKeyDown); 
            } 
               private function keyHandler(event:KeyboardEvent):void
               {
               trace(event.charCode);
               }
            //响应keyup事件 
            private function myKeyUp(evt:KeyboardEvent):void 
            { 
                mx.controls.Alert.show('evt.keyCode=' + evt.keyCode.toString()+"\n"+ "弹起\n", "KeyUp"); 
            } 
             
            //响应keydown事件 
            private function myKeyDown(evt:KeyboardEvent):void 
            { 
                t1.text=t1.text + 'evt.charCode=' + evt.charCode + ' evt.keyCode=' + evt.keyCode + ' evt.keyLocation=' + evt.keyLocation + " 按下\n"; 
            } 
        ]]> 
    </mx:Script> 
    <mx:TextArea x="261"
                 y="226"
                 id="t1"
                 width="381"
                 height="200"/> 
    <mx:TextInput x="372"
                  y="114"
                  id="t2"/> 
</mx:Application>