How to judge the validity of the external chain of website

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The current Web site is carrying out the chain of work, in the process of publishing in the chain to be concerned about the effectiveness of the link, to determine the validity of the link is linked to the release of the platform in the link part of the page to use a number of tags, respectively, the IFRAME, JavaScript, nofollow, These three kinds of labels are also links to work to determine the effectiveness of links to the important basis, the following will be the three types of tags for analysis.

1, IFRAME

An IFRAME tag can easily embed additional pages or content in a Web page in the form of:< iframe src= "URL" width= "x" height= "x" scrolling= "[OPTION]" frameborder= "x" name =

"Main" ></iframe, for the contents of the tag, the user appears to be the content of the current page, but for the search engine, because it is embedded content, will be treated as a separate page, not the current page, Spiders crawl the contents of the IFRAME will not be the content of the current page. Using spider Simulator to crawl the test page, the result does not appear in the IFRAME content, can indicate that the optimization within the tag does not work on the current page.

When looking for a chain of resources, you can view the code of the linked page to see if the link section uses an IFRAME tag.

2. JavaScript

Most of the search engine on JS content is not crawl, so the site's optimization content and other important code can not be written in JS. If the chain Resources page in the link code using JS write, most of the page in the code can not find our link code, so this situation is easy to judge.

3, Nofollow

Nofollow tags are tags created by Google to reduce the impact of spam links on search engine rankings, in the form of:< a href= "http://www.***.com" rel= "nofollow" > Islander Talent Network </A >. For example, Wikipedia will include external links in the page to the nofollow tag, in order to prevent the impact of spam links. At present, Google,msn,yahoo expressed support for the label, Baidu does not support.

The most popular place is blog comments or forums, because these places are the most spam links, many SEO work is in this part of the resources to accumulate the number of sites outside the chain, so many blogs and forum system in the comments or replies in the link automatically add nofollow attribute, Prevents the PR value from being passed to the junk link.

In Baidu, Google in the use of command query outside the chain of reference is poor, so it is not good to judge the effectiveness of the label, and the role of the label is only to reduce the impact of the link, not completely cancel the role of the chain. For example, Yahoo also supports this property, in the Yahoo outside the chain tool query results still have to add nofollow attribute of the chain, example: http://blog.***.com/user/1436766.html, the blog's friendship Link used the label, However, Yahoo outside the chain of tools included in the external chain page.

Therefore, in the absence of specific criteria to judge the role of nofollow, we should reduce or discard the use of this type of resources, in the search for new outside the chain of resources in the process, but also as a basis for judging the validity of links.