namespace app\components;

use yii\base\Widget;

use yii\helpers\Html;  

class HelloWidget extends Widget

{

    public $message;  

    public function init()

    {

      parent::init();

       if ($this->message === null) {

          $this->message = '您好';

        }

    }  

   public function run()

    {

        return Html::encode($this->message);

}

[php] view plaincopy在CODE上查看代码片派生到我的代码片

<?php

use app\components\HelloWidget;

?>

<?= HelloWidget::widget(['message' => '组件']) ?>