博客详细页面分享后无法获取数据，不知道如何解决，onload内调用加载评论函数：代码如下，修改先跳转首页也不行

// pages/weibod/weibod.js
const db = wx.cloud.database()
const app = getApp()
Page({
  /**
   * 页面的初始数据
   */
  data: {
    mask: false,
    inputValue:"",
    hasmore: true,
    comments:[],
    commentsCount:""

  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    //接收下标值
    const index = options.index;
    //获取首页堆栈
    const pages = getCurrentPages();
    //获取首页配置对象
    const indexPage = pages[0];
    //获取首页配置项中的微博数据
    const weibos = indexPage.data.weibos;
    //通过小标值获取weibos数据中的weibo
    console.log(weibos);
    const weibo =weibos[index];
    this.setData({
      weibo:weibo
    });
    this.loadComments(); 
  },
  //加载更多评论
  loadComments: function (start=0) {
    const that = this;
    let promise = db.collection("comment").where({
      weiboid: that.data.weibo._id
    }).orderBy("create_time", "desc");

    promise.count({
      success:function(res){
        that.setData({
          commentsCount:res.total
        })
      }
    })
    //判断start起始位置大于0，则跳过该值
    if(start>0){
      promise=promise.skip(start);
    }
    //否则获取10条记录，
    promise.limit(10).get().then(res => {
      const comments = res.data;
      comments.forEach((comment, index) => {
        comment.create_time = comment.create_time.getTime()
      })
      let hasmore =true;
      //如果评论长度为0，则hasmore为false
      if(comments.length ==0){
        hasmore =false
      }
      let newComment = [];
      //如果start大于0，则将之前comments记性拼接到新的数组里
      if(start > 0){
        newComment = that.data.comments.concat(comments);
        //否则将不进行拼接
      }else{
        newComment = comments;
      }  
      that.setData({
        comments: newComment,
        hasmore:hasmore
      })
    })
  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {
    this.loadComments(0);
  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function (event) {
    this.loadComments(this.data.comments.length);
  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {
    let url = encodeURIComponent('/pages/weibod/weibod?index=${index}')
    return{
      title:'',
      path:'/pages/index/index?url='+url,
    }
  }, 
  onFocusEvent: function (event) {
    this.setData({
      mask: true
    })
  },

  onBlurEvent: function (event) {
    this.setData({
      mask: false
    })
  },
  //监听手机输入框键盘完成事件，并存到数据库中
  onConfirmEvent: function (event) {
    const that = this;
    const content = event.detail.value;
    db.collection("comment").add({
      data: {
        content: content,
        author: app.globalData.userInfo,
        create_time: db.serverDate(),
        weiboid: that.data.weibo._id
      }
    }).then(res => {
      const comment = {
        "_id": res._id,
        "content": content,
        "author": app.globalData.userInfo,
        "create_time": (new Date()).getTime()
      }
      const comments = that.data.comments;     
      comments.splice(0, 0, comment);
      that.setData({
        comments: comments,
      })
    });
    // this.setData({
    //   commentsCount:that.data.comments.length
    // });
    //提交评论后清空输入框的值
    this.setData({
      inputValue:""
    })
  }
})