打开/etc/hosts文件
追加一下命令
http://github.com 204.232.175.94 http://gist.github.com 107.21.116.220
http://help.github.com 207.97.227.252 http://nodeload.github.com 199.27.76.130
http://raw.github.com 107.22.3.110 http://status.github.com 204.232.175.78
http://training.github.com 207.97.227.243 http://www.github.com