主要原理就是修改 hosts 文件。
windows 下
C:\Windows\System32\drivers\etc\hosts
mac 下
Shift + Command + G，前往 /etc/hosts
可以先把 hosts 文件复制在桌面一下，然后用文本编辑器打开，加入如下内容
# GitHub Start 192.30.253.112 Build software better, together 192.30.253.119 gist.github.com 151.101.184.133 assets-cdn.github.com 151.101.184.133 raw.githubusercontent.com 151.101.184.133 gist.githubusercontent.com 151.101.184.133 cloud.githubusercontent.com 151.101.184.133 camo.githubusercontent.com 151.101.184.133 avatars0.githubusercontent.com 151.101.184.133 avatars1.githubusercontent.com 151.101.184.133 avatars2.githubusercontent.com 151.101.184.133 avatars3.githubusercontent.com 151.101.184.133 avatars4.githubusercontent.com 151.101.184.133 avatars5.githubusercontent.com 151.101.184.133 avatars6.githubusercontent.com 151.101.184.133 avatars7.githubusercontent.com 151.101.184.133 avatars8.githubusercontent.com # GitHub End
保存，然后再替换回原位置既可。