修改host, host 文件位置 

C:\Windows\System32\drivers\etc

在文件最下方添加

# GitHub Start
140.82.113.3 github.com
192.30.255.119 gist.github.com
185.199.110.153 assets-cdn.github.com
151.101.108.133 raw.githubusercontent.com
151.101.108.133 gist.githubusercontent.com
151.101.108.133 cloud.githubusercontent.com
151.101.108.133 camo.githubusercontent.com
151.101.108.133 avatars0.githubusercontent.com
151.101.108.133 avatars1.githubusercontent.com
151.101.108.133 avatars2.githubusercontent.com
151.101.108.133 avatars3.githubusercontent.com
151.101.108.133 avatars4.githubusercontent.com
151.101.108.133 avatars5.githubusercontent.com
151.101.108.133 avatars6.githubusercontent.com
151.101.108.133 avatars7.githubusercontent.com
151.101.108.133 avatars8.githubusercontent.com
185.199.109.154 github.githubassets.com
151.101.109.194 github.global.ssl.fastly.net
185.199.111.153 github.io
# GitHub End

如图：

刷新 dns

cmd  输入命令  

 ipconfig /flushdns

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