index.wxml

<view>
  <button  bindtap='insertData'>插入数据</button>
  <button  bindtap='queryData'>请求数据</button>
</view>

index.js

 // 单击“插入数据”按钮调用该函数
  insertData: function () {
    const db = wx.cloud.database({});
    const cont = db.collection('todos');
    cont.add({
      data: {
        description: "向云数据库插入一条数据",
        due: new Date('2018-12-25'),
        tags: [
          "cloud",
          "database"
        ],
      },
      success: function (res) {
        console.log(res._id)
      }
    });
  },
  //  单击“请求数据”按钮执行该函数
  queryData: function () {
    const db = wx.cloud.database({});
    const cont = db.collection('todos');
    cont.doc("XCIGn8DR1TiNF-Pt").get({
      success: function (res) {
        console.log(res.data)
      }
    })
  },

创建todos集合

• 在IDE的云开发中创建