配置user1
Host u1.github.com
 HostName github.com
 IdentityFile C:\Users\admin\.ssh\id_rsa1
 PreferredAuthentications publickey
 User user1
配置user2
Host u2.github.com
 HostName github.com
 IdentityFile C:\Users\admin\.ssh\id_rsa
 PreferredAuthentications publickey
 User user2
配置好之后,需要修改项目中的.git文件下的config文件(怎么改,自己琢磨)