1. I just started learning express and there is a login page. If the verification fails, it will display "The username or password is wrong, please log in again!", and then the page will redirect to the login page after a few seconds, but it has no effect. ：

var express = require('express');
var router = express.Router();

router.post('/', function(req, res){
    var username = req.body.user;
    var password = req.body.password;

    if(username === 'liaoyf' && password === '123'){
        res.send('Welcome!' + username);
    }else{
        res.send('用户名或密码错误！请<a href="/">重新登录</a>');
        //这边我想重定向到登录页（登录页路径为/）
        setTimeout(function(){
            res.redirect('/');
        }, 2000);
    }
});

module.exports = router;

Looking online, it seems that send is completed directly and will not be triggered later. So what should be done?