animation.reverse()

Create a new animation with all reverse values.
译：创建一个反向动画，即所有属性值变化和既定的相反。

layerA = new Layer

animationA = new Animation
    layer: layerA
    properties:
        x: 100

animationB = animationA.reverse()

# Alternate between the two animations   
animationA.on(Events.AnimationEnd, animationB.start)
animationB.on(Events.AnimationEnd, animationA.start)

animationA.start()