How does dedecms enable the second-level domain name and batch change the problem of not displaying images and attachments?

Step 1,
System]-[basic system parameters]. In the core settings, "(yes/no) supports multiple sites, after this option is enabled, the attachment, column connection, and arclist content enable absolute URL "option is enabled.
Step 2,
Bind a second-level domain name in topic settings. In the system background [core]-[website topic management], edit the information for the section "webpage template. In the advanced options section, we first enable multi-site support and bind the domain name
Input domain my http://mb.111cn.net
Step 3: replace the image address in the content. Do not display images and attachments under mb.111cn.net.
Go to the background-core-batch maintenance-replace the database tutorial content
Select the dede_addonarticle field body.
Replaced by src = "/uploads/
Replace with: src = "http://down.111cn.net/uploads/

All right, generate all the pages and bind them to cms,
Step 4: bind a domain name
In your domain name management center, point mb.111cn.net to your server,
Then, bind the current domain name to the directory where you want to enable the second-level domain name on your server, which will result in great efforts.