Flex ActionScript实例代码之移动对象

package {
    import flash.display.Sprite;
    import flash.events.Event;

    public class Main extends Sprite {
        private var _sprite:Sprite = new Sprite(  );
        private var _vx:Number = 3;

        public function Main(  ) {
            _sprite.graphics.beginFill(0x0000ff, 100);
            _sprite.graphics.drawCircle(0, 0, 25);
            _sprite.graphics.endFill(  );
            _sprite.x = 50;
            _sprite.y = 10;
            addChild(_sprite);
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }

        public function onEnterFrame(event:Event):void {
            _sprite.x += _vx;
        }
    }
}