一、在这里连接数据库(我用的可视化工具是mongobooster)
二、在app.js中引用
var express = require("express");
var app = express();
var mongoose = require("mongoose");
mongoose.connect('你的mongodb地址',{user: '用户名', pass: '密码'});
var db = mongoose.connection;
db.on('error', console.error.bind(console, '连接错误:'));
db.on('open', (callback) => {
console.log('MongoDB连接成功!!');
});