[topvip]

在虚拟主机设置文件httpd-vhosts.conf里设置：
<virtualhost *:80>
serveradmin webmaster*dummy-host2.example.com
documentroot /xampp/htdocs/a
servername 'www.a.com'
## errorlog *rel_logfiledir*/dummy-host2.example.com-error_log
## customlog *rel_logfiledir*/dummy-host2.example.com-access_log common
</virtualhost>

<virtualhost *:80>
serveradmin webmaster*dummy-host2.example.com
documentroot /xampp/htdocs/b
servername 'www.b.com'
## errorlog *rel_logfiledir*/dummy-host2.example.com-error_log
## customlog *rel_logfiledir*/dummy-host2.example.com-access_log common
</virtualhost>