让上次犯的错反省出梦想，记一次云小程序写入数据错误

  db.collection('Net_Log')
     .aggregate()
     .match({idk: '20210616'})
     .group({
      _id: '$meal',
      count: $.sum('$people')
     })
     .end()

 const db = wx.cloud.database();
    db.collection('Net_Log').add({
      data: {
        Name: Name,
        idk: idk,
        meal: meal,
        Type: Type,
        Mobile: Mobile,
        InTime: timestamp,
        people: people//<!----这个明明是数字，但写库的时候竟然变成字段。
      },
      success: res => {
        wx.showToast({
          title: '订餐成功',
        })
        let ditem = this.data.ditem;
        ditem.push(meal + "$" + people);
        this.setData({
          ditem: ditem
        })
        wx.setStorage({
          key: "ditem",
          data: ditem
        });
        util.go_home();
      },