How does nginx correspond to resource files in different directories according to different subdomain names?

Question

For example: a.example.com/index.html corresponds to /a-direcoty/index.html, while b.example.com/index.html Corresponds to /b-direcoty/index.html

Answer 1

server {
listen 80;
server_name ~^(?<subdomain>.+).example.com$;
index index.html index.htm;
root /$subdomain-direcoty/;
}

Answer 2

nginx configuration file can set the server segment, and set server_name in the server to specify the domain name. So in this case, set up two servers, one with two domain names, and then set root as a specific directory