Express框架登陆成功后获取到res的数据，并将它存到sessionStorage

Express框架，我一个登录请求，用的是表单提交的请求，我想在登陆成功后获取到res的数据，并将它存到sessionStorage中，怎么操作？第一次接触express，真的烦啊

="myform" action="/login?clang=<%= lang %>" method="post" class="login-rt" onsubmit="return sub()">
            
="loginList">
                
="text-align: right">
                   ="lang" name="lang">
                    
                
                
="loginListRow">
                
                
="loginListRow">
                
                
="loginListRow">
                
                
="pt20">
                    ="submit" class="btn btn-blue btn-login" id="btn" style="word-break:break-all"
                           value=""/>
                
            
        

用代码块功能插入代码，请勿粘贴截图

router.post('/login', passport.authenticate('local', {
    failureRedirect: '/login',
    failureFlash: true
}), function (req, res, next) {
    let body = {};
    body.operate_name = req.i18n_texts.index.login;
    body.operate_time = new Date();
    body.remark = getClientIp(req);
    body.username = req.user.username;
    knex('t_operate_record').insert(body).then(function (data) {
        //添加网页token
        let token = uuid();
        knex('t_user').update({'token': token}).where({'username': body.username}).then(function (out) {
        })
        console.log(token + '+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++')
        req.user.token = token;
        const obj = {};
        obj.token = token;
        obj.roleId = req.user.role;
        res.setHeader('rid', req.user.role);
        res.setHeader('tok', token);
        res.redirect('/?clang=' + req.i18n_lang);
    }).catch(function (err) {
        res.send({code: -1, text: err.message});
    })
});

客户端怎么调用login接口的？ajax还是表单？表单输出js来设置sessionStorage后js进行跳转。而且要存res什么数据？token和role？

            const obj = {};
            obj.token = token;
            obj.roleId = req.user.role;
            res.send(`<script>sessionStorage.set('rid','${req.user.role}');sessionStorage.set('tok','${token}');location.href='/?clang=${ req.i18n_lang}'</script>`)
            //res.setHeader('rid', req.user.role);
            //res.setHeader('tok', token);
            //res.redirect('' + req.i18n_lang);