一个空间绑多域名，.htaccess方法

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If abc.com is your original domain and xyz.com is the domain alias, and
you want people going to abc.com to see one site and people going to
xyz.com to see a different site, and you want the hostname to stay as
the user typed it, make a directory called xyz under /htdocs/www and put
the xyz.com website in it. Then use mod_rewrite in an .htaccess file in
/htdocs/www

RewriteEngine On
  RewriteCond %{HTTP_HOST}  xyz.com$ [NC]
  RewriteCond %{REQUEST_URI} !^/xyz/.*$
  RewriteRule ^(.*)$  /xyz/$1

Now when people go to abc.com they will see the site in /htdocs/www.
When people go to xyz.com, they will be served pages from
/htdocs/www/xyz and the URL in their browser will not change the
hostname or show them the /xyz/.