[AS3]DispatchEvent的古怪問題

如下面代碼：

package {

    import flash.display.Sprite;

    import flash.events.Event;

    import flash.events.EventDispatcher;

 

    public
class TestAction extends Sprite

    {

        private
var _dispatcher:EventDispatcher;

        

        public
function TestAction()

        {

            _dispatcher = new EventDispatcher();

            

            addEventListener(Event.ENTER_FRAME,__enterFrame);

            

            _dispatcher.addEventListener(TestEvent.TEST,__test);

        }

        

        private
var e:TestEvent = new TestEvent(TestEvent.TEST);

        

        private
function __enterFrame(event:Event):void

        {

            _dispatcher.dispatchEvent(e);

        }

        

        private
function __test(event:TestEvent):void

        {

            trace(event);

        }

    }

}

 

此代碼會報如下錯誤：

TypeError: Error #1034: 強制轉換類型失敗:無法將 flash.events::Event@1967b21 轉換為 TestEvent。

    at flash.events::EventDispatcher/dispatchEventFunction()

    at flash.events::EventDispatcher/dispatchEvent()

    at TestAction/__enterFrame()[E:\Flash\TestAction\TestAction.as:23]

 

原因 變數 e在dispatch後再調用第二此dispatch就會報如下錯誤，由此可見，如果Event如果已經dispatch，調用_dispatcher.dispatchEvent(e)，_dispatcher會new 一個Event對象進行發布。