我使用了 express 框架 

目录结构

db.js 文件function connectionDB(hostname, port) {//注释地方暂时没有使用。是把官方代码照抄下来// var Db = require('mongodb').Db;var MongoClient = require('mongodb').MongoClient;var Server = require('mongodb').Server;// ReplSetServers = require('mongodb').ReplSetServers,// ObjectID = require('mongodb').ObjectID,// Binary = require('mongodb').Binary,// GridStore = require('mongodb').GridStore,// Grid = require('mongodb').Grid,// Code = require('mongodb').Code,// BSON = require('mongodb').pure().BSON,// assert = require('assert');return new MongoClient(new Server(hostname, port), {native_parser: true});}exports.connectDB = connectionDB;users.js 文件var db = require('./db');router.get('/list', function (req, res) {var mongoclient = db.connectDB("localhost", 27017);mongoclient.open(function (err, mongoclient) {var db = mongoclient.db("app"); //app是数据库名字db.collection('list').find(function (err, result) { //list是document名字result.toArray(function(err,r){//r取出是 { _id: 5377f937b9cc9a6b70e3726d,// title: 'jqmobile',// listitem: [ 'java', 'php', 'maven' ] }var re = r[0];console.info(re);res.render('list',re); 返回到试图 list.ejs，我使用了express});//res.send('respond with a resource');});});}); list.ejs 　　<%= listitem %>