沒報錯但是取不到值，只能列印出 學習
namespace app\index\controller;
use think\Controller;
class Test1 extends Controller
{
public function index(){
return 'shepi';
}
public function demo3()
{
);
}
public function demo4()
{
return '學習'.$this->request->get('lesson');## 學習'.$this->request->get('lesson');## 學習'. Request::instance()->param('lesson');
}
}
