用.htaccess实现二级域名功能

.htaccess设置以下：
RewriteEngine on
RewriteCond %{HTTP_HOST} ^www.aoyou0898.com$
RewriteCond %{REQUEST_URI} !^/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /$1
RewriteCond %{HTTP_HOST} ^www.aoyou0898.com$
RewriteRule ^(/)?$ /index.php [L]
#主站的伪静态写在以下
#主站的伪静态写在以上
RewriteCond %{HTTP_HOST} ^<span style="font-family: Arial, Helvetica, sans-serif;">qxc</span><span style="font-family: Arial, Helvetica, sans-serif;">.aoyou0898.com$</span>
RewriteCond %{REQUEST_URI} !^/qxc/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /qxc/$1
RewriteCond %{HTTP_HOST} ^<span style="font-family: Arial, Helvetica, sans-serif;">qxc</span>.aoyou0898.com$
RewriteRule ^(/)?$ <span style="font-family: Arial, Helvetica, sans-serif;">qxc</span>/index.php [L]