核心代码 app.js

//app.js 文件名
  var routes = require('./routes/index');
 
  app.use('/index', routes);
  

//index.js 文件名
  var express = require('express'); 
  var router = express.Router();

  router.get('/', function(req, res, next) {
    res.render('index', { title: 'Express' });
  });

  router.get('/about', function(req, res, next) {
    res.json({ user: 'aaa' });
  });

module.exports = router;