Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'root'@'localhost' (using password: NO) in D:\wwwroot\zaizai.icu\function\db.class.php:21 Stack trace: #0 D:\wwwroot\zaizai.icu\function\db.class.php(21): mysqli->__construct('localhost', 'root', '', 'wenquan_auth', 3306) #1 D:\wwwroot\zaizai.icu\function\function_core.php(49): db->__construct('localhost', 'root', '', 'wenquan_auth') #2 D:\wwwroot\zaizai.icu\index.php(1): include('D:\\wwwroot\\zaiz...') #3 {main} thrown in D:\wwwroot\zaizai.icu\function\db.class.php on line 21