数据库确实是打开了 var settings = require(’…/setting’), Db = require(‘mongodb’).Db, Connection = require(‘mongodb’).Connection, Server = require(‘mongodb’).Server; module.exports = new Db(‘node-mongodb’, new Server(‘qicj:Abc334204642@ds023054.mlab.com’, 23054),{safe: true}); 但就是连接不上mlab的数据库，是写法有问题吗？