2.在检测输入栏中输入github.com
3.打开host文件，地址 c:\windows\system32\drivers\etc
把检测列表里的TTL值最小的IP输入到hosts里，并对应写上域名github.com
4.重复以上步骤，查找其他域名
示例代码：
# GitHub Start
192.30.255.112 github.com
104.244.46.185 github.global.ssl.fastly.net
185.199.108.133 raw.githubusercontent.com
185.199.108.133 gist.githubusercontent.com
185.199.108.133 cloud.githubusercontent.com
185.199.108.133 camo.githubusercontent.com
185.199.108.133 avatars.githubusercontent.com
185.199.108.133 avatars0.githubusercontent.com
185.199.108.133 avatars1.githubusercontent.com
185.199.108.133 avatars2.githubusercontent.com
185.199.108.133 avatars3.githubusercontent.com
185.199.108.133 avatars4.githubusercontent.com
185.199.108.133 avatars5.githubusercontent.com
185.199.108.133 avatars6.githubusercontent.com
185.199.108.133 avatars7.githubusercontent.com
185.199.108.133 avatars8.githubusercontent.com
# GitHub End
