不带 www 跳转 到 带 www 网站..

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>

Apache :

RewriteEngine On
RewriteCond %{HTTP_HOST} ^ffff.com [NC]
RewriteRule ^(.*)$ http://www.ffff.com/$1 [L,R=301]