%
select case request.servervariables("http_host")
case " www.xxdxft.cn" '域名1
Server.Transfer("/show/index.asp")
case " show.xxdxft.cn" '域名2
Server.Transfer("blog/index.asp")
case " www.xxdxft.net" '域名3
Server.Transfer("bbs/index.asp")
'...... 繼續添加 ......
case else '域名N
Server.Transfer("XXX/index.asp")
end select
%>

?php
$domain_net=" a.com ";
$domain_com="b.com";
$dot_net_url="index.html";
$dot_com_url="index.asp";
if(($HTTP_HOST=="$domain_net")or($HTTP_HOST==" www.$domain_net "))
{
Header("Location: $dot_net_url");
}
elseif(($HTTP_HOST=="$domain_com")or($HTTP_HOST==" www.$domain_com"))
{
Header("Location: $dot_com_url");
}
else
{
include_once('index.php');
}
?>

switch(location.host){
case ' www.bbb.com ':
location.href=" http://www.bbb.com/bbb/"
break;
}