Express.js的仅会话cookie

以下是我想要的（某种）。当我关闭浏览器时，信息消失了。

var express = require('express');var app = express.createServer();var MemoryStore = require('connect/middleware/session/memory');app.use(express.bodyDeprer());app.use(express.cookieDeprer());app.get('/remember', function(req, res) {    res.cookie('rememberme', 'yes', { expires: new Date() - 1, httpOnly: true });});app.get('/', function(req, res){    res.send('remember: ' + req.cookies.rememberme);});app.listen(4000, '127.0.0.1');