I thought a ladder could solve the problem, but I was naive and wrote down the solution
1. Look up the connection failure domain current IP [https://site.ip138.com/raw.Githubusercontent.com/]

2. Terminal input sudo vi/etc/hosts and a corresponding IP connection failure domain configuration is added to the file, I add the Chinese Hong Kong
151.101.76.133 raw.githubusercontent.com
save after exit
3. Reexecute the install RVM command and it will be successful