Actionscript 3 AS3找到getTimer的一半以允许二次循环

我已经设置好了，这样我就可以按空格键两次，设置一个计时器持续时间来重复一个电影剪辑。。我想用另一段的一半时间重复第二段电影剪辑。因此，对于每个循环，它会循环两次。以下是我尝试过的：

var timeStart:Number;
var loopDuration:Number;
var timeLastLoop:Number;
var rando80:Number;
var rando802:Number;
var rando8:Number;
var randoy:Number;
var halfduration:Number;
 var randomImage:Bitmap;

stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
addEventListener(Event.ENTER_FRAME, onEnterFrame);


function onKeyDown(e:KeyboardEvent):void {
    if (e.keyCode == Keyboard.SPACE) {
        if (!timeStart) { // First time SPACE is hit
            timeStart       = getTimer();

        } else { // Second time SPACE is hit
            loopDuration    = getTimer() - timeStart; // set the loop duration
            halfduration    = (getTimer() - timeStart) *.5;
            timeStart       = NaN; // reset the start time
            loop();
        }
    }
}

function onEnterFrame(e:Event):void {
    rando8 = Math.floor(Math.random() * 7);
    rando80 = Math.floor(Math.random() * 70);
    randoy = Math.floor(Math.random() * -1000);
    rando802 = Math.floor(Math.random() * 70);

 if ( timeLastLoop && halfduration) {
        if (getTimer() >= timeLastLoop + halfduration) { // if it's time to loop
                circleThump2.gotoAndPlay(1);
        }
 }

    if (loopDuration && timeLastLoop) {
        if (getTimer() >= timeLastLoop + loopDuration) { // if it's time to loop
            loop();
        }

    }

}

function loop():void {
    timeLastLoop      = getTimer();
    circleThump.gotoAndPlay(1);
    MovieClipMan.gotoAndPlay(rando80);
    hotdog.gotoAndPlay(rando80);
    MovieClipMan.y    = randoy;
    MovieClipMan2.gotoAndPlay(rando80);
    movieClipColor.gotoAndStop(rando8);
    MovieClipMan2.y   = randoy;

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它只是不起作用，还是有一个特定的问题你需要帮助？是的，问题是它不起作用。有人知道如何让它工作吗？如果有，请告诉我这里发生了什么。非常感谢。