處理方案：
1、先用localhost方式連接到MySQL數據庫，然后使用MySQL自帶的數據庫mysql;
use mysql；
2、執行：select host from user where user = 'root'; 發現，host的值就是localhost。
所以將它的值改掉：update user set host='%' where user = 'root';
3、修改完成后，執行：flush privileges;
將修改內容生效，再次配置時，用IP地址或者localhost 就都能正常連接到MySQL數據庫了。
操作如下：
mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select host from user where user = 'root';
+-----------+
| host |
+-----------+
| localhost |
+-----------+
1 row in set (0.00 sec)
mysql> update user set host='%' where user = 'root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select host from user where user = 'root';
+------+
| host |
+------+
| % |
+------+
1 row in set (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql>