前提
安装git到本地，能在cmd中使用git命令行
步骤
1.设置全局用户名和邮箱
git config –global user.name “kakadanica”
git config –global user.email “kakadanica.gmail.com”
2.生成SSH密钥
ssh-keygen -t rsa -C “kakadnaica@gmail.com”
如果你之前有生成过，控制台会提示你already exist，并给你打印出密钥的地址，建议删除后重新生成。如果你之前未生成过，直接敲三个回车，密码为空，将会提示你生成成功并显示
例如：
Your identification has been saved in /c/Users/E450/.ssh/id_rsa.
Your public key has been saved in /c/Users/E450/.ssh/id_rsa.pub.
The key fingerprint is:
Your public key has been saved in /c/Users/E450/.ssh/id_rsa.pub.
The key fingerprint is:
3.添加密钥到github上
找到id_rsa.pub文件，使用记事本打开，复制内容。
登录GitHub，到https://github.com/settings/keys该页面中，新建new SSH Key。
输入任意Title，将刚刚复制的内容粘贴到key中，保存提交。
结果
在cmd中执行ssh git@github.com命令操作
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘github.com,192.30.255.112’ (RSA) to the list of known hosts.
PTY allocation request failed on channel 0
Hi kakadanica! You’ve successfully authenticated, but GitHub does not provide shell access.
Connection to github.com closed.
如上，表示设置成功！