IIS:

 <rule name="已导入的规则 1-1" stopProcessing="true">

                    <match url="^(.*)$" ignoreCase="false" />

                    <conditions logicalGrouping="MatchAll">

                        <add input="{HTTP_HOST}" pattern="^maijiaxinyu.com" />

                    </conditions>

                    <action type="Redirect" url="http://www.maijiaxinyu.com/{R:1}" redirectType="Permanent" />

                </rule>

RewriteEngine On

RewriteCond %{HTTP_HOST} ^ffff.com [NC]

RewriteRule ^(.*)$ http://www.ffff.com/$1 [L,R=301]