在本地host文件中添加映射，步骤如下：

1.用文本编辑器打开hosts文件，位于C:\Windows\System32\drivers\etc目录下；
Linux下路径：/etc/hosts

2.打开 http://tool.chinaz.com/dns ,这是一个查询域名映射关系的工具

3.查询 github.global.ssl.fastly.net 和 assets-cdn.github.com 两个地址

4.多查几次，选择一个稳定，延迟较低的 ip 按如下方式添加到host文件

5.保存文件

6.刷新DNS

ipconfig /flushdns  // ipconfig和/flushdns之间有个空格才行
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host文件：

# For example:
#
#      102.54.94.97     rhino.acme.com          # source server
#       38.25.63.10     x.acme.com              # x client host

# localhost name resolution is handled within DNS itself.
#   127.0.0.1       localhost
#   ::1             localhost

# github
192.30.253.112 assets-cdn.github.com
151.101.88.249 github.global.ssl.fastly.net
192.30.253.113 github.com
151.101.184.133 assets-cdn.github.com
185.199.108.153 documentcloud.github.com
192.30.253.118 gist.github.com
185.199.108.153 help.github.com
192.30.253.120 nodeload.github.com
151.101.184.133 raw.github.com
18.204.240.114 status.github.com
192.30.253.166 training.github.com
192.30.253.112 www.github.com
151.101.185.194 github.global.ssl.fastly.net
151.101.184.133 avatars0.githubusercontent.com
151.101.184.133 avatars1.githubusercontent.com