1. db.collection('todos').add({
    2.   // data 字段表示需新增的 JSON 数据
    4.     description: "learn cloud database",
    5.     tags: [
    6.       "cloud",
    7.       "database"
    8.     ],
    9.     done: false
    10.   }
    11. })
    12. .then(res => {
    13. })