我不能让它工作。我已经打开了mongo和mongod，这是我在git Bash或cmd中编写“node server.js”时得到的结果：

Running on server27017
Not connected to database MongoNetworkError: connection 0 to localhost:27017 
closed

字符串
这是我的代码

var express = require('express');
var app = express();
var port = 27017;
//Route
app.get('/', function (req, res) {
    res.send('Hello world!');
});
const mongoose = require('mongoose');
const option = {
    socketTimeoutMS: 30000,
    keepAlive: true,
    reconnectTries: 30000
};
mongoose.connect('mongodb://localhost:27017/database1', option).then(function(){
    //connected successfully
    console.log('Successfully connected to database');
}, function(err) {
    //err handle
    console.log('Not connected to database ' + err);
});
//Listen to port
app.listen(port, function(){
    console.log('Running on server' + port);
});

型
当我在浏览器中写入“http://localhost:27017/database1“时，我得到“看起来你试图在本地驱动程序端口上通过HTTP访问MongoDB”。