目前帖子在分类页面中按最后添加的排序，这是代码，请如何使其随机

if (is_category()) {
        $categories = array(get_query_var(\'cat\'));
        $subcats = get_categories(array(\'child_of\' => get_query_var(\'cat\')));
        if ($subcats) {
            foreach ($subcats as $subcat) {
                array_push($categories, $subcat->cat_ID);
            }
        }

        if (of_get_option(\'show_repins\') != \'disable\') {            
            $args = array(
                \'category__in\' => $categories,
                \'paged\' => $paged
            );
        } else {
            $args = array(
                \'category__in\' => $categories,
                \'paged\' => $paged,
                \'meta_query\' => array(
                    \'relation\' => \'OR\',
                    array(
                        \'key\' => \'_Original Post ID\',
                        \'compare\' => \'NOT EXISTS\'
                    ),
                    array(
                        \'key\' => \'_Original Post ID\',
                        \'value\' => \'deleted\'
                    )
                )
            );  
        }
        query_posts($args); 
    }