1. 打开文件：

2. 添加以下内容

# GitHub Start 
140.82.112.4 http://github.com 
151.101.185.194 http://github.global.ssl.fastly.net 
203.98.7.65 http://gist.github.com 
13.229.189.0 http://codeload.github.com
185.199.109.153 http://desktop.github.com 
185.199.108.153 http://guides.github.com
185.199.108.153 http://blog.github.com 
18.204.240.114 http://status.github.com 
185.199.108.153 http://developer.github.com 
185.199.108.153 http://services.github.com 
192.30.253.175 http://enterprise.github.com
34.195.49.195 http://education.github.com
185.199.108.153 http://pages.github.com
34.196.237.103 http://classroom.github.com
# GitHub End

3. 刷新DNS缓存