看著官網文件搞了半天，也不知所已，最後還是搜尋了一下，還是中文好懂
1 下載解壓部分略。。。
2 新增環境變數
在path後加上xx盤：/xx目錄/mysql-5.7.12-winx64/bin
3 mysql-5.7.12-winx64目錄下新建my.ini配置檔案（也可以直接複製my-default檔案然後改名），開啟my.ini檔案，裡面寫入以下內容（具體路徑，以自己的為準）
# For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the # *** default location during install, and will be replaced if you # *** upgrade to a newer version of MySQL. [client] default-character-set=utf8 [mysqld] port=3306 basedir ="D:/軟體/web/mysql/mysql-5.7.12-winx64/" datadir ="D:/軟體/web/mysql/mysql-5.7.12-winx64/data/" tmpdir ="D:/軟體/web/mysql/mysql-5.7.12-winx64/data/" socket ="D:/軟體/web/mysql/mysql-5.7.12-winx64/data/mysql.sock" log-error="D:/軟體/web/mysql/mysql-5.7.12-winx64/data/mysql_error.log" #server_id = 2 #skip-locking max_connections=100 table_open_cache=256 query_cache_size=1M tmp_table_size=32M thread_cache_size=8 innodb_data_home_dir="D:/軟體/web/mysql/mysql-5.7.12-winx64/data/" innodb_flush_log_at_trx_commit =1 innodb_log_buffer_size=128M innodb_buffer_pool_size=128M innodb_log_file_size=10M innodb_thread_concurrency=16 innodb-autoextend-increment=1000 join_buffer_size = 128M sort_buffer_size = 32M read_rnd_buffer_size = 32M max_allowed_packet = 32M explicit_defaults_for_timestamp=true sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION" #sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
4 cmd 以管理員身份進入“命令提示符”
cd 進入mysql-5.7.12-winx64\bin目錄下
輸入：mysqld --initialize 會自動新增data目錄
輸入：mysqld install MySQL --defaults-file="D:/xx目錄/mysql-5.7.12-winx64/my.ini" 具體路徑根據自己的去寫(如果提示已經有了 就輸入mysqld remove 移除再執行上面的命令)
輸入：net start mysql 就可以啟動啦
mysql的預設密碼為空哦， 你可以自己去設定mysql的密碼
補充一下改密碼的命令：
進入mydql>後
輸入 mysql>use mysql
mysql> update user set authentication_string=password('123456')where user='root';
mysql> flush privileges;
mysql> quit