Widget扩展一般用于页面组件的扩展，在页面根据需要输出不同的内容，下面介绍一下ThinkPHP中Widget的两种写法及调用

写法一：

ArticlWidget.class.php文件：

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);    }}

模板文件articleList.html在Lib/Widget/Article目录下

         
      
        {
   $articleList_vo.title}    
     

写法二：

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');    }}

模板文件articleList.html，内容同写法一，但放在Tpl/风格名/Widget/目录下

如果模板文件放在ArticleWiget.class.php文件所在目录的Article文件夹下，则写法如下：

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