https://developers.weixin.qq.com/miniprogram/dev/wxcloud/reference-sdk-api/database/collection/Collection.get.html

data:  {

    cnt : 0,

    TodoResult:[],

  },

let self = this;

    const db = wx.cloud.database({env: 'lsun-grid-afyq8'})

    db.collection('Building').where({

      Neighbourhood: _Neighbourhood

    }).count().then(res => {

      this.setData({cnt : res.total}),

      console.log("11111", res.total)//这行能打印出21

    })

    console.log("count:",self.data.cnt)//这行只能打印出0

……

这样写为什么打印出来的count是0？实际应为21