如何从生成mongodb游标的同一发布中读取值

const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017/mydatabase';

MongoClient.connect(url, function(err, client) {
  if (err) throw err;
  console.log('Connected to MongoDB');

  // 在这里执行读取游标的操作
});

const db = client.db('mydatabase');
const collection = db.collection('users');

const cursor = collection.find({ name: 'John' });

cursor.next(function(err, doc) {
  if (err) throw err;
  console.log(doc);
});

try {
  const doc = await cursor.next();
  console.log(doc);
} catch (err) {
  console.error(err);
}

try {
  while (await cursor.hasNext()) {
    const doc = await cursor.next();
    console.log(doc);
  }
} catch (err) {
  console.error(err);
}