当passport.authenticate中存在successRedirect时，Express仅重定向到所需页面

const express = require('express');
const passport = require('passport');
const LocalStrategy = require('passport-local').Strategy;
const session = require('express-session');

const app = express();

// 配置会话
app.use(session({
  secret: 'your_secret_key',
  resave: false,
  saveUninitialized: false
}));

// 初始化 Passport 和会话支持
app.use(passport.initialize());
app.use(passport.session());

// 用户模型示例（假设 User 模型已经定义）
const User = require('./models/user');

// 配置本地策略
passport.use(new LocalStrategy(
  function(username, password, done) {
    User.findOne({ username: username }, function (err, user) {
      if (err) { return done(err); }
      if (!user) { return done(null, false); }
      if (!user.validPassword(password)) { return done(null, false); }
      return done(null, user);
    });
  }
));

// 序列化和反序列化用户对象
passport.serializeUser(function(user, done) {
  done(null, user.id);
});

passport.deserializeUser(function(id, done) {
  User.findById(id, function(err, user) {
    done(err, user);
  });
});

// 登录路由
app.post('/login', 
  passport.authenticate('local', {
    successRedirect: '/dashboard',
    failureRedirect: '/login',
    failureFlash: true
  })
);

// 登录页面路由
app.get('/login', (req, res) => {
  res.render('login');
});

// 仪表盘页面路由
app.get('/dashboard', (req, res) => {
  res.render('dashboard');
});

// 启动服务器
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});