当用户点击view时，触发动画，只能执行一次动画而已么？再点无效

    methods = {
        onRobot () {
            console.log('onRobot')
            let bodyAnimation = wx.createAnimation({
                duration: 300,
                timingFunction: 'ease'
            })

            bodyAnimation.rotateZ(-35).step()
            bodyAnimation.rotateZ(35).step()
            bodyAnimation.rotateZ(0).step()

            this.bodyAnimation = bodyAnimation.export()
        }
  }