/**
  * 文章缓存
  */
 public function articleCache($param)
 {
     $article = new DArticle();
     $res = $article->getAllArticle();
     $i = 0;
     foreach ($res as $k => $v) {
         if (CacheHelper::$param['function']($param['key_prefix'], $v, true)) {
             $i++;
         }
     }
     return $i;
 }