NodeJs session using

For example to log

The basic implementation principle:

1. The client through the account password
2. Server receives the request parameters, generate the sessionId sessionId stored in a cookie to the client
3. The next time a client requests to bring cookie, get a cookie server to verify the identity of sessionId
4. Response user authentication by the client, which is a successful login

Instructions:

1. node.js the need to use express-session achieve session function. Use npm instsall express-session download.
2. Import module express-session const session = require ( 'express-session');
3. Configuring session

   app.use(session({
   secret: 'secret key', //使用随机自定义字符串进行加密
   saveUninitialized: false,//不保存未初始化的cookie，也就是未登录的cookie
   cookie: {
               maxAge: 24 * 60 * 60 * 1000 //设置cookie的过期时间为1天
               activeDuration: 5* 60*1000, // 激活时间，比如设置为30分钟，那么只要30分钟内用户有服务器的交互，那么就会被重新激活。
   }
   }))

   4. Save the user information when the user logs

   app.post('/login', async (req,res) => {
       const { email, password } = req.body;
       let user = await User.findOne({ email: email });
       if (user.password == password){
           req.session.user = user;//登录成功将用户信息存储到session下面
           res.redirect('/home/');
       }else{
           res.render('login.art',{error:'账号或者密码错误'})
       }
   })