onShow: function () {
  var that = this
  // 心跳动画
  var animation = wx.createAnimation({
    duration: 1000,
    timingFunction: 'linear',
    delay: 1000,
    transformOrigin: '50% 50% 0',//放缩位置
  });

  //that.animation = animation
  //that.setData({
  //  animation: that.animation.export()
  //});

  that.data.timehandle = setInterval(function () {

    that.animation.scale(1.15).step();
    that.setData({
      animation: that.animation.export()
    });

  }.bind(that), 1000);
}