app.js

let express = require('express');
require('./lib/common');
let app = express();

app.set('port', process.env.PORT || 3000);

// 处理res返回值
let static = require('./middlewares/static/index');
app.use(static);

// 处理请求
let bodyParser = require('./middlewares/body-parser/index');
app.use(bodyParser);

// 处理res返回值
let response = require('./middlewares/response/index');
app.use(response);

// 进入路由
let routes = require('./routes/index');
routes(app);

// 定制404 页面
app.use(function(req, res) {
  res.type('text/plain');
  res.status(404);
  res.send('404 - Not Found');
});


app.listen(app.get('port'), function() {
  console.log(`服务启动 http://localhost:${app.get('port')}`);
});