thinkphp5 controller cannot pass value mdoel

Question

<?php
namespace app\admin\controller;
use app\model\Admin;
use think\Controller;
class Login extends Controller
{
public function login()
                                                                                                                                                                                                  Received data passed to the model layer Model
$ res = (new admin ())-& gt; login (input ('post.'));
}
Return $ This- & gt; fetch () ;
}
}

<?php

namespace app\model;
use think\Loader;

use think\ Model;

class Admin extends Model{

public function login($data){

halt($data);
}
}

?>

Answer 1

Why not use the helper function model(Admin)->login();

Answer 2

Is there any error report or prompt