数据库连接失败

<h1>数据库连接失败</h1><p>错误信息：SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO)</p><p>配置信息：Array
(
    [type] => mysql
    [hostname] => 127.0.0.1
    [database] => saas_cn
    [username] => root
    [password] => 
    [hostport] => 3306
    [dsn] => 
    [params] => Array
        (
        )

    [charset] => utf8mb4
    [prefix] => fa_
    [debug] => 1
    [deploy] => 0
    [rw_separate] => 
    [master_num] => 1
    [slave_no] => 
    [read_master] => 
    [fields_strict] => 1
    [resultset_type] => array
    [auto_timestamp] => 
    [datetime_format] => Y-m-d H:i:s
    [sql_explain] => 
    [builder] => 
    [query] => \think\db\Query
    [break_reconnect] => 
    [break_reconnect_num] => 3
)
</p>