正在學mongodb和node.js,現(xiàn)在想做個練習，后端獲取數(shù)據(jù)庫中的數(shù)據(jù)，通過res.send發(fā)送給前端頁面

var express = require('express');
var MongoClient = require('mongodb').MongoClient;
var router = express.Router();
var url = "mongodb://127.0.0.1:27017";
router.get('/', function(req, res, next) {
  res.render('goods',{title:'goods'});
});
router.get('/list', function(req, res, next) {
        MongoClient.connect(url, function(err, db) {
        if(err) throw err;
        let immocmall = db.db('immocmall');
        let mall_goods = immocmall.collection('mall-goods');
        查詢productId為201710003的數(shù)據(jù)
        var search = {"productId":201710003};
        mall_goods.find(search ,function(err, cursor) {
            //如何將數(shù)據(jù)發(fā)送給頁面
            res.send(cursor.toString())
        })

    })
})