无法在Express中使用MongoDB连接到Mongoose地图集

npm install mongoose mongodb

const express = require('express');
const mongoose = require('mongoose');

const app = express();

// 连接MongoDB地图集
mongoose.connect('mongodb+srv://<username>:<password>@<cluster-url>/<database>?retryWrites=true&w=majority', {
  useNewUrlParser: true,
  useUnifiedTopology: true,
})
  .then(() => {
    console.log('Connected to MongoDB Atlas');
  })
  .catch((error) => {
    console.error('Error connecting to MongoDB Atlas', error);
  });

// 其他Express中的路由和中间件
// ...

app.listen(3000, () => {
  console.log('Server started on port 3000');
});