<VirtualHost *:80>
    DocumentRoot "D:\phpweb.cn\wwwroot"
    ServerName demo.phpweb.cn
    ServerAlias demo.phpweb.cn
<IfModule mod_rewrite.c>
  Options +FollowSymlinks
  RewriteEngine On

 
  RewriteRule ^(.*)/admin.php$ $1/index.php
</IfModule>

</VirtualHost>