thinkPHP5框架渲染模板的3种方式简述

namespace app\index\controller;
use think\view;
class Index{
 public function index(){
  $view = new view();
  return $view->fetch('index');
 }
}

namespace app\index\controller;
class Index{
 public function index() {
  return view('index');
 }
}

namespace app\index\controller;
use think\Controller;
class Index extends Controller{
 public function index(){
  $this->assign('domain', $this->request->url(true));
  return $this->fetch('index');
 }
}