<view animation="{{animationData}}" style="background:red;height:100rpx;width:100rpx;opacity:0"></view>

 data: {
    animationData: {}
  },

var animation = wx.createAnimation({
        duration: 1000,
        timingFunction: 'ease',
    })    
    this.animation = animation
    animation.opacity(1).step()    
    this.setData({
      animationData:animation.export()
    })