app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');//在控制台中，显示req请求的信息
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');//node.js 中间件，用于处理 JSON, Raw, Text 和 URL 编码的数据
var session = require('express-session');

var index = require('./routes/index');
var users = require('./routes/users');
var login = require('./routes/login');
var test = require('./routes/test');

var app = express();

// view engine setup
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')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

//使用 session 中间件
app.use(session({
    secret :  'secret', // 对session id 相关的cookie 进行签名
    resave : false,
    saveUninitialized: false, // 是否保存未初始化的会话
    cookie : {
        maxAge : 1000 * 60 * 10, // 设置 session 的有效时间，单位毫秒
    },
}));

app.use('/index', index);
app.use('/', login);
app.use('/users', users);
app.use('/login', login);
app.use('/test', test);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
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');
});

module.exports = app;