(1장 섹션6 (43페이지))

package {
    import flash.display.Sprite;
    import flash.events.KeyboardEvent;
    
    public class ExampleApplication extends Sprite {
        public function ExampleApplication() {
            stage.focus = this;
            stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown); // stage.가 앞에 붙어야함
        }
        
        private function onKeyDown(event:KeyboardEvent):void {
            trace("key down: " + event.charCode);
        }
    }
}