很多站长朋友都有这个疑问,就是在site:phpvar.com和site:www.phpvar.com的时候的结果不同，有的时候可能数量会差出很多。
大多数网站这两个地址访问的都是相同的，但是在对外宣传的时候，人们使用的链接方式则不同，有些人喜欢带有www，有些人不喜欢，这样的结果就是这两种域名格式虽然是对待同一个网站，但外链的数量和质量则有天壤之别，没有几个人做外链的时候会把这两种格式都用上把，搜索引擎对这两个域名并不是看做一个处理，而会对这两个域名收录数据分别入库而不进行统一，最终导致了搜索结果有区别。
懂得一些网络知识的人都知道所谓的顶级域名应该是phpvar.com 之类的域名是才是真正的顶级域名,那么www.phpvar.com就是二级域名，这时候有人发问了,不是说顶级的域名权重大于二级域名么?对呀.这么说是非常正确滴,如果你不懂SEO,单纯的站在网民的角度考虑.你直接丢两个域名过去给他看phpvar.com 、www.semcmd.com 这两个域名给他看.问他那个是顶级域名啊.他的回答肯定是www.phpvar.com 。现在很多站点普遍都是加了www这都是站到用户体验的角度来做的.谁叫带www已经成为互联网的规格的呢?那么到底是带www的域名高还是不带的高呢?借用网络上的一句话:"只要符合用户搜索习惯的东西，Search engine一定会重视,规则是死的，人是活的，是可以变通的。同样，Search engine也是活的，他也懂变通的。"
简单的来说就是 用户认为是好的,搜索引擎方面还是会给予权重的，站到用户体验和老网民的角度来说,DJ小象的意见是绑定带www的.然后给不带www 做域名转向或者301跳转相信设置参考[301转向和网址规范化]
一来所有的用户量不会少.二来避免重复收录,三来,域名不到www的做了这样的转向 百度实验也是收录滴.
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