npm init -y
npm install body-parser cookie-parser debug ejs express morgan serve-favicon express-session connection-mongo mongoose connect-flash multer async -save
--save-dev = -D --save = -S
#创建并初始化git
git init
git add -A
git commit -m "初始化项目和依赖的模块"
git remote add origin https:??github.com/zzzzz
git push origin master
#创建服务 express+mongoose
let express = require('express')
let app = express()
app.listen(8080)
#跑通路由