AS3 键盘的事件与实现

学习AS3 事件机制，看到一个简单的actionscript 游戏动画，比较简单，一个红球按照你方向键移动         as3 学习群:41394416    脚本娃娃

代码如下：

package
{
   import flash.display.SpreadMethod;
   import flash.display.Sprite;
   import flash.events.KeyboardEvent;
   import flash.ui.Keyboard;

   public class ball extends Sprite
  {
     private var balls:Sprite = new Sprite();
     public function ball()
    {
      init();
    }
     public function init(): void{
      addChild(balls);
      balls.graphics.beginFill(0xFF0000);
      balls.graphics.drawCircle(0,0,30);
      balls.graphics.endFill();
      balls.x = stage.stageWidth/2;
      balls.y = stage.stageHeight/2;
      stage.addEventListener(KeyboardEvent.KEY_DOWN,ballrect);
    }
    
     public function ballrect(event:KeyboardEvent): void{
       switch(event.keyCode){
         case Keyboard.UP:
          balls.y -=10;
           break;
         case Keyboard.DOWN:
          balls.y +=10;
           break;
         case Keyboard.LEFT:
          balls.x -=10;
           break;
         case Keyboard.RIGHT:
          balls.x += 10;
           break;
         default:
           break;
      }
    }
  }
}

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