安装

npx express-generator
npm install -g express-generator
express
express --view-pug myapp
cd myapp
npm install
DEBUG=myapp:* npm start  // mac linux启动
set DEBUG=myapp:* & npm start // win启动
// http://localhost:3000/查看

Route

/routes/users.js

var express = require('express');
var router = express.Router();

router.get('/',function(req,res,next){
  res.send('respond user list');
})
router.get('/:id',function(req,res,next){
  res.send('respond one user');
})

module.exports = router

/app.js

var user_router = require('./routes/users');
app.use('users',user_router)

环境

app.get('env');  // development / production