这个问题首先网上的都是using password :yes ,然后我发现我的是no ,但是目前我还没有发现有什么区别，等后续用的多了，再来update
解决方案：
vim /etc/my.cnf
添加
[mysqld]
skip-grant-tables
(因为我发现百度上的人都是自己就有mysqld ，本来我是直接follow 他们直接加了skip ，但是没有生效，于是另外加上了[mysqld])
最后
[root@localhost ~]# systemctl restart mysqld.service --> 重新启动mysql service
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 7
Server version: 8.0.13 Source distribution
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> exit;
Bye