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SEO优化之rel=nofollow属性

nofollow是HTML元标签(meta)的content属性和链接标签(a)的rel属性的一个值,告诉机器(爬虫)无需追踪目标页,为了对抗blogspam(博客垃圾留言信息),Google推荐使用nofollow,告诉搜索引擎爬虫无需抓取目标页,同时告诉搜索引擎无需将的当前页的Pagerank传递到目标页。但是如果你是通过sitemap直接提交该页面,爬虫还是会爬取,这里的nofollow只是当前页对目标页的一种态度,并不代表其他页对目标页的态度。

  1. nofollow的使用
  2. nofollow的作用
  3. PR修剪(Pagerank sculpting)
  4. SEO建议

nofollow的使用

两种用法:
  1. 用于meta元标签:<meta name="robots" content="nofollow" />,告诉爬虫该页面上所有链接都无需追踪。
  2. 用于a标签:<a href="login.aspx" rel="nofollow">登录</a>,告诉爬虫该页面无需追踪。

nofollow的作用

主要有三个作用:
  1. 防止不可信的内容,最常见的是博客上的垃圾留言与评论中为了获取外链的垃圾链接,为了防止页面指向一些拉圾页面和站点。
  2. 付费链接:为了防止付费链接影响Google的搜索结果排名,Google建议使用nofollow属性。
  3. 引导爬虫抓取有效的页面:避免爬虫抓取一些无意义的页面,影响爬虫抓取的效率。

PR修剪(Pagerank Sculpting)

nofollow的滥用,一些SEO为了做到搜索引擎的最大优化,通过nofollow来控制PR的流动,可以很好的优化一些特定页面。当然这种优化比较适合一些已经积淀了相当数量PR的老站点。为了防止PR修剪和nofollow的滥用,Google已经减弱了nofollow的作用,以前的nofollow不仅仅不会造成PR流动,同时不会造成PR损失,现在的nofollow规定虽然也不会造成PR流向目标页,但是原本流向的目标页的将会损失掉。比方当前页PR为1,而且页面上有10个链接,其中一个是nofollow的链接,根据先前的nofollow的规定,每个非nofollow链接指向的目标页将获得1/9的PR,含nofollow的链接不能获得PR,而根据现在Google对nofollow的新规定,非nofollow链接指向的目标页只能获得1/10,nofollow链接同样不能获得PR,也就是损失了1/10的PR。

SEO建议

nofollow在Google的作用已经很弱,所以SEO要控制站点的PR的流动,避免链接指向垃圾页面,只能靠人工审核的方法。
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