@hyr 新下载的版本，安装页出现的。 Fatal error: Uncaught Error: Undefined constant "DB_PREFIX" in D:\wwwsns\core\Database.php:19 Stack trace: #0 D:\wwwsns\core\Database.php(44): Database->__construct() #1 D:\wwwsns\core\View.php(48): Database::getInstance() #2 D:\wwwsns\core\View.php(32): View::getCurrentTheme() #3 D:\wwwsns\install\InstallController.php(19): View->__construct() #4 D:\wwwsns\install.php(27): InstallController->__construct() #5 {main} thrown in D:\wwwsns\core\Database.php on line 19