public function index() {
$tag = trim($_GET['tag']);
$page = max(intval($_GET['page']), 1);
$page_size = 10; // 每页显示的记录数量
$offset = ($page - 1) * $page_size;
$sql = "SELECT * FROM v9_news WHERE FIND_IN_SET('$tag', tags) LIMIT $offset, $page_size";
$data = $this->db->getAll($sql);
$total_sql = "SELECT COUNT(*) AS total FROM v9_news WHERE FIND_IN_SET('$tag', tags)";
$total = $this->db->getOne($total_sql)['total'];
$this->assign('data', $data);
$this->assign('page', $page);
$this->assign('total_pages', ceil($total / $page_size));
$this->display('tag_index');}