js中如何设置session

npm install express-session

const express = require('express');
const session = require('express-session');

const app = express();

app.use(session({
  secret: 'your-secret-key', // 用于签名session ID cookie的密钥
  resave: false, // 强制将会话保存回会话存储区，即使在请求期间会话未被修改
  saveUninitialized: true, // 强制将未初始化的会话保存到存储
  cookie: { secure: false } // 如果设置为true，那么只有在HTTPS连接上才会发送cookie
}));

app.get('/', (req, res) => {
  // 设置session
  req.session.user = { id: 1, username: 'JohnDoe' };
  res.send('Session set!');
});

app.get('/profile', (req, res) => {
  // 获取session
  const user = req.session.user;
  if (user) {
    res.send(`Welcome back, ${user.username}`);
  } else {
    res.send('Please login first.');
  }
});

app.listen(3000, () => console.log('Server running on port 3000'));

document.cookie = "sessionid=123456; path=/"; // 设置一个名为sessionid的Cookie