Flash AS3：在帧到帧上补间 MC 到 MC

Question

我正在尝试在 Flash CS3 中构建四帧动画。 背景图像（每个都设置为 MovieClips）在每一帧上都会发生变化，并且我想在每个 MC 上放置淡出/淡入过渡。 但我似乎无法让它正常工作。 这是我的代码：

if (currentFrame == 1) {
    var alphaTweenOut1:Tween = new Tween (image1, "alpha", Regular.easeOut, 100, 0, 1, true);
    var alphaTweenIn2:Tween = new Tween (image2, "alpha", Regular.easeIn, 0, 100, 3, true);
} else if (currentFrame == 2) {
    var alphaTweenOut2:Tween = new Tween (image2, "alpha", Regular.easeOut, 100, 0, 1, true);
    var alphaTweenIn3:Tween = new Tween (image3, "alpha", Regular.easeIn, 0, 100, 3, true);
} else if (currentFrame == 3) {
    var alphaTweenOut3:Tween = new Tween (image3, "alpha", Regular.easeOut, 100, 0, 1, true);
    var alphaTweenIn4:Tween = new Tween (image4, "alpha", Regular.easeIn, 0, 100, 3, true); 
} else {
    var alphaTweenOut4:Tween = new Tween (image4, "alpha", Regular.easeOut, 100, 0, 1, true);       
    var alphaTweenIn1:Tween = new Tween (image1, "alpha", Regular.easeIn, 0, 100, 3, true);
    //loop back to first frame (there is a 5th frame that is triggered on mouse events)
    gotoAndPlay(1);
}