在express服务器的成员变量(类实例)之间传递数据的体系结构/方法

app.get('/route1', (req, res, next) => {
  req.customData = 'Hello World';
  next();
});

app.get('/route2', (req, res) => {
  console.log(req.customData); // 输出 'Hello World'
  res.send('Data received');
});

let customData = 'Hello World';

app.get('/route1', (req, res, next) => {
  customData = 'Modified Data';
  next();
});

app.get('/route2', (req, res) => {
  console.log(customData); // 输出 'Modified Data'
  res.send('Data received');
});

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

app.use(session({
  secret: 'secret-key',
  resave: false,
  saveUninitialized: true
}));

app.get('/route1', (req, res, next) => {
  req.session.customData = 'Hello World';
  next();
});

app.get('/route2', (req, res) => {
  console.log(req.session.customData); // 输出 'Hello World'
  res.send('Data received');
});