修改mysql允许访问的权限：Host ‘LAPTOP-9VT1D63G‘ is not allowed to connect to this MySQL server

nodejs 中用localhost或者127.0.0.1连接数据库可以，但是使用本机 ip4地址连接时，失败，报错如下

ER_HOST_NOT_PRIVILEGED: Host 'LAPTOP-9VT1D63G' is not allowed to connect to this MySQL server

意思是没有权限，所以把权限开开即可：

//先打开命令窗口，登录自己的mysql
mysql -u root -h 127.0.0.1 -P3306 -p//查看它允许访问的用户
select host,user from mysql.user;//发现只有localhost//设置一下允许访问的用户，这里%设置所有用户都可访问
update mysql.user set host = '%' where user = 'root';//执行让修改生效
flush privileges;

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修改mysql允许访问的权限：Host ‘LAPTOP-9VT1D63G‘ is not allowed to connect to this MySQL server

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