nodejs不会重定向到用户个人资料页面

Question

我用nodejs和mysql创建了一个登录系统，用户在其中输入用户名和密码。问题是，当用户输入错误的用户名或密码时，系统会警告用户，但是如果详细信息正确，则节点服务器应呈现主页，但实际上没有任何反应。请帮忙！下面是我的服务器代码：

class Solution {
public:
    bool cmp(pair<int,int> a, pair<int, int> b)
    {
        if(a.first!=b.first) return a.first < b.first;
        else return a.second > b.second;
    }
    vector<vector<int>> reconstructQueue(vector<vector<int>>& people) {

        vector<vector<int>> rlt(people.size());
        sort(people.begin(), people.end(), cmp);
        ...
    }
};

下面是我的客户端代码：

var express=require('express');
var app=express();
var mysql=require('mysql');
var path=require('path');
var bodyParser=require('body-parser');
var session=require('express-session');
app.use(bodyParser.urlencoded({extended: true}));
app.use(express.json());
app.use(express.urlencoded());
app.use(express.static(__dirname+'/public'));
app.set('view engine','ejs');
var connection=mysql.createConnection({
	host: 'localhost',
	user: 'root',
	password: 'vipul1234',
	database: 'employee'
});
connection.connect((function(err){
	if(err){
		console.log('error connecting;'+err.stack);
	}
	else{
		console.log('connected as id:'+connection.threadID);
	}
}));
app.use(session({
	secret : "secret_password",
	resave : true,
	saveUninitialized : true
}));
app.get('/',function(req, res){
	res.sendFile(path.join(__dirname+'/login.html'));
});
app.get('/home',function(req, res){
	if(req.session.loggedin!=true){
		return res.redirect('/login.html');
		res.end();
	}
	else{
		console.log("hello");
		return res.render('dashboard',{username: req.session.usernm});
	}
	res.end();
});
app.post('/auth',function(req, res){
	console.log(req.body);
	var usernm=req.body.usrnm;
	var passwd=req.body.passwrd;
	console.log(usernm);
	var obj={};
	if(usernm&&passwd){
		var sql="select * from signup where username='"+usernm+"' and password='"+passwd+"';";
		connection.query(sql, function(err, result){
			if(err) throw err;
			if(result.length!=0)
			{
				req.session.loggedin=true;
				req.session.username=usernm;
				return res.redirect('/home');
			}
			else{
			obj={'message':'Incorrect Username and/or Password'};
			}
			obj=JSON.stringify(obj);
			res.send(obj);
			
		});
	}
});
app.listen(3000);

            $(function(){				
                $('#submitbut').on('click',function(event){
                	var obj={};
                	var usrnm=$('#usernm').val();
                	var passwrd=$('#passwd').val();
                	obj.usrnm=usrnm;
                	obj.passwrd=passwrd;
                 	$.ajax({
						type: 'POST',
						dataType: 'json',
						data: obj,
                        url: 'http://localhost:3000/auth',			
                        success: function(response) {
                        		alert(response.message);
                        }
                    });
                });				
            });