左右眼动画

让小丑的左右眼能够动起来，需要监听事件，用到两事件指针位于元素上方时（mouseover），鼠标从元素上移开时（mouseout）,执行动画操作。

var leftEyeTween = new Kinetic.Tween({
    node: leftEye,
    duration: 1,
    easing: Kinetic.Easings.ElasticEaseOut,
    y: -100,
    points: [0, 200, 50, 150, 100, 200, 50, 200]
});

var rightEyeTween = new Kinetic.Tween({
    node: rightEye,
    duration: 1,
    easing: Kinetic.Easings.ElasticEaseOut,
    y: -100,
    points: [0, 200, 50, 150, 100, 200, 50, 200]
});