1.关闭mysql
   # service mysqld stop
2.屏蔽权限
   # mysqld_safe --skip-grant-table
   屏幕出现: Starting demo from .....
3.新开起一个终端输入
   # mysql -u root mysql
   mysql> delete from user where USER='';
   mysql> FLUSH PRIVILEGES;//记得要这句话,否则如果关闭先前的终端,又会出现原来的错误
   mysql> \q

终于发现是因为mysql数据库的user表里,存在用户名为空的账户即匿名账户,导致登录的时候是虽然用的是root,但实际是匿名登录的,通过错误提示里的''@'localhost'可以看出来,

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