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对于设置301重定向有很多好处，其中之一就是利于seo防止搜索引擎误操作将多域名站点设置为作弊站点，同时也减少权重分散，像访问www.ihuan.me/1046.html则会被跳转到ihuan.me/1046.html增强流量的汇集。具体方法如下。
1.新建一个站点，对应目录如D:\wwwroot\301web。该目录下只需要1个文件，即index.html或者加个404.htm。绑定要跳转的域名，如图：
2.在IIS中选中刚才我们建立的站点，右键，属性，主目录，选择重定向到，输入网址如：http://www.xxxx.com，同时注意选中下面的资源的永久重定向选项。如下图：
3.到此，我们已经完成了将xxxx.com这个域名301重定向到www.xxxx.com的工作。
注意问题：
“上面输入准确的 URL(X)”这个选项建议不要选。
不选的结果是：
当输入xxxx.com转到了www.xxxx.com，
当输入xxxx.com/sanwen/suibi/时，转到了www.xxxx.com/sanwen/suibi/。
选上的结果是：
当你输入xxxx.com或者xxxx.com/sanwen/suibi/都会转到www.xxxx.com。
好了，如果只是想把不带www的转到带www的或者其他没有用过的域名转到正在使用的域名，这样就可以了。但是如果你要的域名已经做过网站，想要把权重传递给新网站，可以参考下面这个方法：
第一步同上，主要是第二步，如图：
注意红色字体的部分，在重定向到地址的后面多了$S$Q字符，即写成了http://www.xxxx.com$S$Q。“上面输入准确的 URL(X)”这个选项也打了勾。
对于$S$Q字符，这里解释一下：
$S 将请求的URL 的后缀传递给新的URL。后缀是用重定向的URL 代替之后，初始URL 中所保留的部分。
如果未设置 EXACT_DESTINATION 标志，则结果目标URL 的名称将具有所请求文件的名称(作为文件夹名称)以及文件名本身。
$Q 将初始URL 中的参数(如 querystring 参数)传递至新的 URL，包括问号(?)。
如果不加上$S$Q字符的话，内页的301都会跳转到首页，加上$S$Q字符的目的就是内页也能准确的跳转到新域名的对应内页。
好了，这样就完成了301永久重定向的设置，设置好之后最好能测试下是否返回的是301值，推荐个网址：http://www.seoconsultants.com/tools/headers。
百度对301的反应并不像想象中那么慢，第二天就收录了xxxx.com这个页面，快照最新。当然，快照的内容是www.xxxx.com的内容，而不是301web里index.html的内容。
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