crm/app/model/SmartScreenConstruction.php

<?php

namespace app\model;

use think\Model;

class SmartScreenConstruction extends Model
{
    public function designer(){
        return $this->belongsTo(Employee::class, 'designer_id')->bind(['designer_name' => 'name']);
    }

    public function employee(){
        return $this->belongsTo(Employee::class, 'employee_id')->bind(['employee_name' => 'name']); 
    }
}