1、解压压缩包，放置到任意目录
注意目录最好是英文
这是我的目录：
D:\Python\mysql-8.0.12-winx64\
2. 初始化
用管理员权限打开CMD或者Windows Powershell
使用命令：
mysqld --initialize --console
使用CMD命令操作如下：
C:\Windows\system32>D:\Python\mysql-8.0.12-winx64\bin\mysqld --initialize --console
2018-09-13T14:36:55.758742Z 0 [System] [MY-013169] [Server] D:\Python\mysql-8.0.12-winx64\bin\mysqld (mysqld 8.0.12) initializing of server in progress as process 3104
2018-09-13T14:37:12.072904Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: 4P!w2fqBruGi
2018-09-13T14:37:23.274980Z 0 [System] [MY-013170] [Server] D:\Python\mysql-8.0.12-winx64\bin\mysqld (mysqld 8.0.12) initializing of server has completed
记录下密码，后面修改密码还要用
在这里：
[Server] A temporary password is generated for root@localhost: 4P!w2fqBruGi
最后面的4P!w2fqBruGi就是密码，密码是随机生成的每个人都不一样
3. 安装
使用命令：
mysqld --install
C:\Windows\system32>D:\Python\mysql-8.0.12-winx64\bin\mysqld --install
Service successfully installed.
4. 启用服务
使用命令：
net start mysql
C:\Windows\system32>D:\Python\mysql-8.0.12-winx64\bin>net start mysql
MySQL 服务正在启动 ..
MySQL 服务已经启动成功。
5. 修改密码
输入命令登陆：
mysql -u root -p
输入刚才保存的密码
使用命令：ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码';
D:\Python\mysql-8.0.12-winx64\bin>mysql -u root -p
Enter password: ************
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.12
mysql> ALTER user 'root'@'localhost' IDENTIFIED BY '111111'
-> ;
Query OK, 0 rows affected (1.98 sec)
6. 使用新密码登陆
使用命令：mysql -u root -p
D:\Python\mysql-8.0.12-winx64\bin>mysql -u root -p
Enter password: ******
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.0.12 MySQL Community Server - GPL
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
7.配置环境变量：
进入 计算机--高级系统设置--高级--环境变量
然后新建系统变量
变量值改为自己mysql解压的路径
变量名：MYSQL_HOME
变量值：D:\Python\mysql-8.0.12-winx64
path里添加：%MYSQL_HOME%\bin;(分号不要忘记)
重新打开CMD或者Windows Powershell，之直接输入mysql登陆
