npm i express --save
npm i cookie-parser --save
npm i express-session --save

var express = require('express');
var cookieParser = require('cookie-parser');
var session = require('express-session');

var app = express()
app.use(cookieParser())

const hour = 1000 * 60 * 60;
var sessionOpts = {
 // 設(shè)置密鑰
 secret: 'a cool secret',
 // Forces the session to be saved back to the session store
 resave: true,
 // Forces a session that is "uninitialized" to be saved to the store.
 saveUninitialized: true,
 // 設(shè)置會(huì)話cookie名, 默認(rèn)是connect.sid
 key: 'myapp_sid',
 // If secure is set to true, and you access your site over HTTP, the cookie will not be set.
 cookie: { maxAge: hour * 2, secure: false }
}
app.use(session(sessionOpts))

app.use(function(req, res, next) {
 if (req.url === '/favicon.ico') {
  return
 }

 // 同一個(gè)瀏覽器而言，req是同一個(gè)
 var sess = req.session;
 console.log(sess)

 if (sess.views) {
  sess.views++;
 } else {
  sess.views = 1;
 }
 res.setHeader('Content-Type', 'text/html');
 res.write('<p>views: ' + sess.views + '</p>');
 res.end();
});

app.listen(4000);

npm i connect-redis --save

var express = require('express');
var cookieParser = require('cookie-parser');
var session = require('express-session');

var RedisStore = require('connect-redis')(session);

var app = express()
app.use(cookieParser())

var options = {
 host: '127.0.0.1',
 port: 6379,
 db: 1, // Database index to use. Defaults to Redis's default (0).
 prefix: 'ID:' // Key prefix defaulting to "sess:"
 // pass: 'aaa' // Password for Redis authentication
}

const hour = 1000 * 60 * 60;
var sessionOpts = {
 store: new RedisStore(options),
 // 設(shè)置密鑰
 secret: 'a cool secret',
 // Forces the session to be saved back to the session store
 resave: true,
 // Forces a session that is "uninitialized" to be saved to the store.
 saveUninitialized: true,
 // 設(shè)置會(huì)話cookie名
 key: 'myapp_sid',
 // If secure is set to true, and you access your site over HTTP, the cookie will not be set.
 cookie: { maxAge: hour * 8, secure: false }
}
app.use(session(sessionOpts)) // 如果沒有secret，會(huì)提醒 Error: secret option required for sessions

app.use(function(req, res, next) {
 if (req.url === '/favicon.ico') {
  return
 }

 var sess = req.session;
 var id = req.sessionID; // session ID, 只讀
 console.log(sess, id);

 if (sess.views) {
  sess.views++; // 如果放在res.end()后，不會(huì)自增
  res.setHeader('Content-Type', 'text/html');
  res.write('<p>views: ' + sess.views + '</p>');
  res.write('<p>expires in: ' + (sess.cookie.maxAge / 1000) + 's</p>');
  res.end();
 } else {
  sess.views = 1;
  res.end('welcome to the session demo. refresh!');
 }
});

app.listen(4000);

npm i connect-mongo --save

var express = require('express');
var cookieParser = require('cookie-parser');
var session = require('express-session');

var MongoStore = require('connect-mongo')(session);
const hour = 1000 * 60 * 60

var app = express()
app.use(cookieParser())
app.use(session({
 secret: 'a cool secret',
 key: 'mongo_sid',
 cookie: { maxAge: hour * 8, secure: false },
 resave: true,
 saveUninitialized: true,
 store: new MongoStore({
  url: 'mongodb://@localhost:27017/demodb'
 })
}));

app.use(function(req, res, next) {
 if (req.url === '/favicon.ico') {
  return
 }

 var sess = req.session;
 var id = req.sessionID; // session ID, 只讀
 console.log(sess, id);

 if (sess.views) {
  sess.views++;
 } else {
  sess.views = 1;
 }

 res.setHeader('Content-Type', 'text/html');
 res.write('<p>views: ' + sess.views + '</p>');
 res.write('<p>expires in: ' + (sess.cookie.maxAge / 1000) + 's</p>');
 res.write('<p>httpOnly: ' + sess.cookie.httpOnly + '</p>');
 res.write('<p>path: ' + sess.cookie.path + '</p>');
 res.write('<p>secure: ' + sess.cookie.secure + '</p>');
 res.end();
});

app.listen(4000);