切换到mysql的mysql数据库，找到user表；
cmd:mysql -u root -p
cmd:use mysql;
cmd:select host,user,password from user;
更新user表信息：
cmd:update user set host = '%' where user = 'root';
为root用户授权密码为root：
cmd:grant all privileges on *.* to root@'%' identified by 'root';
刷新权限：
cmd:flush privileges;