键盘事件

var box = new Sprite();
addChild(box);
box.graphics.beginFill(0xff0000);
box.graphics.drawRect(0,0,40,40);
box.graphics.endFill();
box.x = stage.stageWidth/2;
box.y = stage.stageHeight/2;
stage.addEventListener(KeyboardEvent.KEY_DOWN,keyevt);
function keyevt(event:KeyboardEvent):void{
 switch(event.keyCode){
  
  case Keyboard.UP:
  box.y-=10;
  break;
  
  case Keyboard.DOWN:
  box.y+=10;  
  break;
  
  case Keyboard.LEFT:
  box.x-=10;
  break;
  
  case Keyboard.RIGHT:
  box.x+=10;
  break;
  
  default:
  box.x = 0;
  box.y = 0;
  break;
  }
 
 }