问题是：想点击登录根据返回的status信息实现跳转，但是返回的是个空的status。
直接上代码
前台请求的代码

这个是路由里面的响应代码

router.post('/login',function(req,res){
    return  dao.User(req.body.username)
     .then(function (error,result) {       
        var  user={
            username:result[0].username,
            password:result[0].password
        }
         console.log(user);      
         if(req.body.username==user.username&&req.body.password==user.password){
           
            req.session.user = user;
            res.sendStatus(200);            
            }
        else{
             
             req.session.error = "用户名或密码不正确";
             res.sendStatus(404);             
              }
       });

数据库查询的代码

  function User(username,callback) {
                return db.msql.query('select * from User where username="'+username+'"')
                .then(function (data) {
                    console.log(data);
                return callback(null,data);                    
                 });
    }

运行日志信息如下

 express:router use / query +0ms
  express:router use / expressInit +0ms
  express:router use / logger +0ms
  express:router use / jsonParser +41ms
  express:router use / urlencodedParser +5ms
  express:router use / cookieParser +1ms
  express:router use / session +1ms
  express:router use / serveStatic +3ms
  express:router use /  +6ms
  express:router use / router +1ms
  express:router use /users router +3ms
  express:router use /  +3ms
  express:router use /  +1ms
  express:router use /  +2ms
  express:router dispatching POST /users/login +2s
  express:router query  : /users/login +5ms
  express:router expressInit  : /users/login +11ms
  express:router logger  : /users/login +3ms
  express:router jsonParser  : /users/login +8ms
  express:router urlencodedParser  : /users/login +9ms
  express:router cookieParser  : /users/login +52ms
  express:router session  : /users/login +3ms
  express:router serveStatic  : /users/login +6ms
  express:router   : /users/login +1ms
  express:router router  : /users/login +1ms
  express:router dispatching POST /users/login +1ms
  express:router trim prefix (/users) from url /users/login +3ms
  express:router router /users : /users/login +20ms
  express:router dispatching POST /login +4ms
  express:router dispatching GET /users/login? +9ms
  express:router query  : /users/login? +1ms
  express:router expressInit  : /users/login? +2ms
  express:router logger  : /users/login? +5ms
  express:router jsonParser  : /users/login? +6ms
  express:router urlencodedParser  : /users/login? +4ms
  express:router cookieParser  : /users/login? +2ms
  express:router session  : /users/login? +10ms
  express:router serveStatic  : /users/login? +4ms
  express:router   : /users/login? +18ms
  express:router router  : /users/login? +2ms
  express:router dispatching GET /users/login? +4ms
  express:router trim prefix (/users) from url /users/login? +3ms
  express:router router /users : /users/login? +3ms
  express:router dispatching GET /login? +1ms
GET /users/login? 304 99.863 ms - -
POST /users/login - - ms - -
  express:router dispatching GET /stylesheets/manage_style.css +79ms
  express:router query  : /stylesheets/manage_style.css +7ms
  express:router expressInit  : /stylesheets/manage_style.css +15ms
  express:router logger  : /stylesheets/manage_style.css +8ms
  express:router jsonParser  : /stylesheets/manage_style.css +5ms
  express:router urlencodedParser  : /stylesheets/manage_style.css +3ms
  express:router cookieParser  : /stylesheets/manage_style.css +1ms
  express:router session  : /stylesheets/manage_style.css +1ms
  express:router serveStatic  : /stylesheets/manage_style.css +6ms
GET /stylesheets/manage_style.css 304 38.838 ms - -
[ RowDataPacket { username: 'admin', password: 'admin' } ]

从日志里看是POST请求先响应了一个空的status，所以导致登录跳转不了，请大神帮忙看下是哪里写的不对，谢谢！