Mongo和node js要返回的查询没有重复，不重复

db.users.distinct("name")

const MongoClient = require('mongodb').MongoClient;

const url = 'mongodb://localhost:27017';
const dbName = 'mydb';

MongoClient.connect(url, function(err, client) {
  if (err) throw err;
  
  const db = client.db(dbName);
  const collection = db.collection('users');
  
  collection.distinct("name", function(err, result) {
    if (err) throw err;
    
    console.log(result);
    client.close();
  });
});

const express = require('express');
const MongoClient = require('mongodb').MongoClient;

const app = express();
const url = 'mongodb://localhost:27017';
const dbName = 'mydb';

app.get('/users', function(req, res) {
  MongoClient.connect(url, function(err, client) {
    if (err) throw err;
    
    const db = client.db(dbName);
    const collection = db.collection('users');
    
    collection.distinct("name", function(err, result) {
      if (err) throw err;
      
      res.json(result);
      client.close();
    });
  });
});

app.listen(3000, function() {
  console.log('Server is running on port 3000');
});