（Server selection timed out after ${serverSelectionTimeoutMS} ms，此说明）;. MongoServer选择错误：连接电子连接拒绝：：1：27017

const {MongoClient}=require('mongodb');

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

const client= new MongoClient(url);

const dataBase= 'nodejs';

async function getdata(){
    
    let result= await client.connect(); 
     console.log('connect to server')
    let db= result.db(dataBase)
    console.log('2')
    let collection = db.collection('node');
    let response= await collection.find({}).toArray();
    console.log(response)
}

getdata();