让一个图片匀速转圈的动画在安卓上边正转完后倒转，不知道有没有人遇到过

animations:function(){

var animation = wx.createAnimation({

duration: 2000,

timingFunction: ‘linear’,

})

this.animation = animation

this.setData({

animationData: animation.export()

})

var n = 0;

setInterval(function () {

n = n + 1;

console.log(n);

this.animation.rotate(360 * (n)).step()

this.setData({

animationData: this.animation.export()

})

}.bind(this), 2000)

},