How to remove domain name links when uploading javascript-Typecho attachments!

I want to modify the attachment Upload and remove the domain name at the beginning, so that I can change the domain name or go to the subdirectory without having to change the link of the weekly chapter! I would like to ask you where to change it?

I want to modify the attachment Upload to remove the beginning of http: // domain name. in this way, I think I can change the domain name or transfer it to a subdirectory without having to change the link of the weekly chapter!
I would like to ask you where to change it?

Reply content:

I want to modify the attachment Upload to remove the beginning of http: // domain name. in this way, I think I can change the domain name or transfer it to a subdirectory without having to change the link of the weekly chapter!
I would like to ask you where to change it?

Thank you!