问微信小程序 onShareAppMessage组件 自定义分享内容无效？

onShareAppMessage: function (res) {

  console.log(res.from);

  let _this = this;

  let shareObj = {

    title: '自定义转发标题',

    path: '/pages/main/main',

    //imageUrl: _this.cardPic,

    success: function (res) {

      console.log("转发成功！");

      console.log(res);

    }

  }

  console.log(shareObj);

  return shareObj;

}