参考这一篇，2.3 修改 hosts。测试有效。
注：不保证长期有效，如果失效，请以原博客更新为准。
Windows系统的hosts文件在C:\Windows\System32\drivers\etc\hosts，打开后在文件末尾添加：
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# GitHub Start
140.82.113.3 github.com
140.82.114.20 gist.github.com
151.101.184.133 assets-cdn.github.com
151.101.184.133 raw.githubusercontent.com
199.232.28.133 raw.githubusercontent.com
151.101.184.133 gist.githubusercontent.com
151.101.184.133 cloud.githubusercontent.com
151.101.184.133 camo.githubusercontent.com
199.232.96.133 avatars.githubusercontent.com
151.101.184.133 avatars0.githubusercontent.com
199.232.68.133 avatars0.githubusercontent.com
199.232.28.133 avatars0.githubusercontent.com
199.232.28.133 avatars1.githubusercontent.com
151.101.184.133 avatars1.githubusercontent.com
151.101.108.133 avatars1.githubusercontent.com
151.101.184.133 avatars2.githubusercontent.com
199.232.28.133 avatars2.githubusercontent.com
151.101.184.133 avatars3.githubusercontent.com
199.232.68.133 avatars3.githubusercontent.com
151.101.184.133 avatars4.githubusercontent.com
199.232.68.133 avatars4.githubusercontent.com
151.101.184.133 avatars5.githubusercontent.com
199.232.68.133 avatars5.githubusercontent.com
151.101.184.133 avatars6.githubusercontent.com
199.232.68.133 avatars6.githubusercontent.com
151.101.184.133 avatars7.githubusercontent.com
199.232.68.133 avatars7.githubusercontent.com
151.101.184.133 avatars8.githubusercontent.com
199.232.68.133 avatars8.githubusercontent.com
199.232.96.133 avatars9.githubusercontent.com
# GitHub End
如果因没有修改权限而无法保存，可以将hosts文件复制一份到桌面，修改之后，复制回去覆盖原文件。