npm install vue-router
*npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: boss_demo@1.0.0
npm ERR! Found: vue@2.6.14
npm ERR! node_modules/vue
npm ERR! vue@"^2.5.2" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer vue@"^3.2.0" from vue-router@4.0.14
npm ERR! node_modules/vue-router
npm ERR! vue-router@"*" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See D:\Program Files\nodejsCache\node_cache\eresolve-report.txt for a full report.
npm ERR! A complete log of this run can be found in:*

使用 npm install vue-router@3.2.0 -S 即可

1. 确认此机器没有安装过mysql。
2. 进入root用户，按照提示输入密码
   su – root
3. 系统清理
   1)Centos7会自带mysql的分支版本mariadb，需要先将其清除。首先输入命令
   2)rpm -qa |grep -i mariadb

查询是否存在mariadb，如果存在查询结果如图所示
如果存在，采用命令yum remove + 名称清除（如果不存在直接进行下一步）

当运行后出现Complete则运行成功
3)查看是否存在mysql的安装包，如果存在就按上面的方式进行删除。

4. 解压mysql的压缩包，执行如下命令
   tar –xvzf mysql-5.7.32-1.el7.x86_64.rpm-bundle.tar
5. 进入解压目录，rpm安装
   rpm -ivh mysql-community-common-5.7.32-1.el7.x86_64.rpm
   rpm -ivh mysql-community-libs-5.7.32-1.el7.x86_64.rpm
   rpm -ivh mysql-community-client-5.7.32-1.el7.x86_64.rpm
   rpm -ivh mysql-community-server-5.7.32-1.el7.x86_64.rpm

注意：
1）必须按顺序安装；

6. 启动mysql，执行如下命令
   systemctl start mysqld
7. 设置root密码
   a）查看临时密码，输入如下命令
   grep password /var/log/mysqld.log

临时密码为后面红框框起来的部分
b）重置密码
登陆mysql
mysql –u root –p

输入如下命令重设密码:
set password = password("新密码")
例：set password = password("HaHa@654321");

开启远程访问
grant all privileges on . to root@'%' identified by "123456";
远程访问限定IP,%换为IP
grant all privileges on . to root@'192.168.1.22' identified by "123456";