mongoose如何连接数据库

npm i mongoose@5

model/db.js 

​
const mongoose = require('mongoose')
mongoose.connect('mongodb://localhost:27017/数据库名',(err)=>{
    if(!err){
        console.log('数据库连接成功');
    }
})
module.exports = mongoose

​

model.js

const mongoose = require('./db')
const Schema = mongoose.Schema

const loginSchema = new Schema({})
const loginModel = mongoose.model('login',loginSchema,'login')

module.exports = {
    loginModel
}