Node.js之webstorm创建node express项目初始文件解析

1.app.js

//加载express path等模块
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

//加载路由文件
var index = require('./routes/index');
var users = require('./routes/users');

//创建express实例
var app = express();

// 设置模板引擎和页面存放路径
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));

//加载日志中间件
app.use(logger('dev'));
//加载解析json的中间件
app.use(bodyParser.json());
// 加载解析urlencoded请求体的中间件
app.use(bodyParser.urlencoded({ extended: false }));
// 加载解析cookie的中间件
app.use(cookieParser());
// 设置public文件夹为存放静态文件的目录
app.use(express.static(path.join(__dirname, 'public')));

// 路由控制器
app.use('/', index);
app.use('/users', users);

// 捕获404错误，并转发到错误处理器
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// 开发环境下的错误处理器，将错误信息渲染error模版并显示到浏览器中
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

// 导出app实例供其他模块调用
module.exports = app;

2.bin/www

#!/usr/bin/env node

/**
 * Module dependencies.
 */
// 引入导出的app实例
var app = require('../app');
// 引入debug模块，打印调试日志
var debug = require('debug')('demo:server');
var http = require('http');

/**
 * Get port from environment and store in Express.
 */

// 设置端口号
var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

/**
 * Create HTTP server.
 */

var server = http.createServer(app);

/**
 * Listen on provided port, on all network interfaces.
 */

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
  var addr = server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);
}

注：参照 http://www.jianshu.com/p/7b0a5d4491ba