- 当前 Bug 的表现（可附上截图）

- 预期表现

- 复现路径

- 提供一个最简复现 Demo

var option = {

duration: 1000,

timingFunction: 'ease-in'

}

var animation = wx.createAnimation(option)

animation.translateY(-100)

animation.opacity(0.5)

animation.step(option)

this.setData({

animation: animation.export()

})

setTimeout(res => {

animation.translateY(0)

animation.opacity(1)

animation.step(option)

this.setData({

animation: animation.export()

})

}, 1000)