class ArticleWidget extends Widget {
  /**
   *
   * @param array $data
   * @return type
   * 调用方法：{:W('ArticleList',array('cid'=>25,'limit'=>5))}
   * cid为分类id，limit为调用数量
   */
  public function render($data) {
    $Article = M('Article');
    $articleMap["cid"] = $data["cid"];
    $data["articleList"] = $Article->where($articleMap)->order('id desc')->limit($data["limit"])->select();
    foreach ($articleList as $key => $value) {
      if ($value["thumbnail"] == "") {
        $data["articleList"][$key]["thumbnail"] = '/Public/Img/Common/noThumbnail.jpg';
      }
    }
    return $this->renderFile('articleList', $data);
  }
}

<volist name="articleList" id="articleList_vo">
  <li>
    <a href="__APP__/Channel/articleDetail/code/article/id/{$articleList_vo.id}" rel="external nofollow" title="{$articleList_vo.title}">{$articleList_vo.title}</a>
  </li>
</volist>

class ArticleWidget extends Action {
  /**
   *
   * @param array $data
   * @return type
   * 调用方法：{:R('Article/articleList',array('cid'=>25,'limit'=>5),'Widget')}
   * cid为分类id，limit为调用数量
   */
  public function articleList($cid, $limit) {
    $Article = M('Article');
    $articleMap["cid"] = $cid;
    $data = $Article->where($articleMap)->order('id desc')->limit($limit)->select();
    foreach ($data as $key => $value) {
      if ($value["thumbnail"] == "") {
        $data[$key]["thumbnail"] = '/Public/Img/Common/noThumbnail.jpg';
      }
    }
    $this->assign('articleList', $data);
    $this->display('Widget:articleList');
  }
}

$this->display(dirname(__FILE__) . '/Article/articleList.html');