从Mongodb查询响应中检索值

// 导入Mongodb驱动程序
const MongoClient = require('mongodb').MongoClient;

// 连接到Mongodb数据库
const url = 'mongodb://localhost:27017';
const dbName = 'mydb';
MongoClient.connect(url, function(err, client) {
  if (err) throw err;
  console.log('Connected successfully to server');

  const db = client.db(dbName);

  // 查询条件
  const query = { age: { $gt: 18 } };

  // 返回字段
  const projection = { name: 1, age: 1 };

  // 执行查询操作
  db.collection('users').find(query, projection).toArray(function(err, result) {
    if (err) throw err;
    console.log(result);
    client.close();
  });
});