ActionScript 3.0 and 'TypeError: Error#1034: type Coercion failed'

Question

我目前正在学习一个教程，我看了 6-7 遍，但出于某种原因，我不断收到：

TypeError: Error#1034: type Coercion failed.

我正在尝试为学校作业制作配对游戏，目前我有这个：

package {

    import flash.display.MovieClip;
    import flash.utils.Timer;
    import flash.events.TimerEvent;
    import flash.events.Event;
    import flash.events.MouseEvent;


    public class MatchingGame extends MovieClip {

        var fClip:Logo
        var sClip:Logo
        var myTimer:Timer
        var frames:Array = new Array(1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10);

        public function MatchingGame() {
            // Constructor code

            for(var i:Number=1; i<=5; i++) {
                for(var j:Number=1; j<=4; j++) {
                    var myLogo:Logo = new Logo();
                    var index = Math.floor(Math.random() * frames.length)

                    myLogo.frameNo = frames[index];
                    frames.splice(index, 1);

                    addChild(myLogo);
                    myLogo.x = j*100;
                    myLogo.y = i*100;

                    myLogo.gotoAndStop(11);
                    myLogo.addEventListener(MouseEvent.CLICK, openLogo);
                }
            }
        }

        private function openLogo(e:MouseEvent) {
            var clickObj:Logo = Logo(e.target);

            if(fClip == null) {
                    fClip = clickObj;
                    fClip.gotoAndStop(fClip.frameNo);
            }
            else if(sClip == null && fClip != clickObj) {

                sClip = clickObj;
                sClip.gotoAndStop(sClip.frameNo);

                if(fClip.frameNo == sClip.frameNo) {
                    myTimer = new Timer(1000, 1);
                    myTimer.start();
                    myTimer.addEventListener(TimerEvent.TIMER_COMPLETE, removeLogos);
                }
                else {
                    myTimer = new Timer(1000, 1);
                    myTimer.start();
                    myTimer.addEventListener(TimerEvent.TIMER_COMPLETE, resetLogos);
                }
            }
        }

        private function removeLogos(e:TimerEvent) {
            removeChild(fClip);
            removeChild(sClip);
            myTimer.removeEventListener(TimerEvent.TIMER_COMPLETE, removeLogos);
            fClip = null;
            sClip = null;
        }

        private function resetLogos(e:TimerEvent) {
            fClip.gotoAndStop(11);
            sClip.gotoAndStop(11);
            myTimer.removeEventListener(TimerEvent.TIMER_COMPLETE, resetLogos);
            fClip = null;
            sClip = null;
        }
    }
}

错误在第 38 行弹出，当我尝试调试时它告诉我 clickObj 未定义。我该如何解决这个问题？

这是完整的错误消息：

TypeError: Error #1034: Type Coercion failed: cannot convert flash.display::MovieClip@a3e4a61 to Logo.
at MatchingGame/openLogo()[H:\Informatica\Matching game\MatchingGame.as:39]

Answer 1

从 MovieClip 到 Logo 的转换似乎无效。在该行之前添加跟踪以查看 event.target 是什么。

根据 display list structure and event bubbling，您可能会得到与预期不同的元素。

尝试 var clickObj:Logo = Logo(e.currentTarget); 作为快速测试。请务必阅读 Trevor McCauley 的文章以更好地理解事件冒泡。

ActionScript 3.0 and 'TypeError: Error#1034: type Coercion failed'

ActionScript 3.0 and 'TypeError: Error#1034: type Coercion failed'

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