我已经在mongodb atlas中创建了一个新集群，但我无法将node.js应用程序与之连接。我是后端新手，正在学习mongodb。

Error: querySrv ENODATA _mongodb._tcp.cluster0.onw2w.mongodb.net
at QueryReqWrap.onresolve [as oncomplete] (dns.js:206:19) {
    errno: undefined,
    code: 'ENODATA',
    syscall: 'querySrv',
    hostname: '_mongodb._tcp.cluster0.onw2w.mongodb.net'
}

服务器正在成功运行。在连接到atlas之前，我的应用程序正在运行。我从一开始就再次创建了一个新集群，这样我可以确保在创建集群时没有出错。
server.js文件

const mongoose = require('mongoose');
const dotenv = require('dotenv');
const app = require('./app');
dotenv.config({ path: './config.env' });

const DB = process.env.DATABASE.replace(
  '<PASSWORD>',
  process.env.DATABASE_PASSWORD
);

mongoose
  .connect(DB, {
    useNewUrlParser: true,
    useCreateIndex: true,
    useFindAndModify: false,
    useUnifiedTopology: true,
  })
  .then((con) => console.log('DB connection successful🍾....'))
  .catch((error) => console.log(error));

const tourSchema = new mongoose.Schema({
  // to specify a schema for our model
  name: {
    type: String,
    require: [true, 'A tour must have a name'], // validator
    unique: true,
  },
  rating: {
    type: Number,
    require: 4.5,
  },
  price: {
    type: Number,
    require: [true, 'A tour must have a price'],
  },
});

const Tour = mongoose.model('Tour', tourSchema);

const testTour = new Tour({
  // it is an instance of the tour model
  name: 'The forest Hiker',
  rating: 4.7,
  price: 497,
});

testTour
  .save() // this will save the data in the Tour collection in the database it will return a promise
  .then(doc => console.log(doc))
  .catch(err=> console.log('error: ', err))

const port = process.env.PORT || 8000;
app.listen(port, '127.0.0.1', () => {
  console.log(`server running on port ${port}🎈.......`);
});

.env文件

NODE_ENV=devlopment
PORT=8000
USERNMAE=IrfanAsif
DATABASE_PASSWORD=zAC8yIHLJIegJHSQ
DATABASE=mongodb+srv://irfan:<PASSWORD>@cluster0.onw2w.mongodb.net/myFirstDatabase?retryWrites=true&w=majority