SEO do not careless to alert the chain invisible Killer

Today in a website to see such a post, because Sohu blog robots.txt file in writing always make a low-level error, write a letter U, leading to Sohu blog was googlek off.

　　

Imagine the hard work on the blog on the outside chain, the result of the programmer careless, resulting in your efforts in vain. There is nothing more tragic than this. So, Dayu write down this article, to remind Webmaster friends do outside the chain, do not careless, must be wary of the following chain invisible killer.

Killer one: robots.txt

Disallow URL in Robots.txt will prohibit search engine access, allow indexing, display search results. Well-known is Taobao shielding Baidu Spider. Due to press, Sohu blog robots.txt file error has been modified. Dayu has queried Sina, NetEase, Sohu, Tencent's blog channel robots.txt files, have not found a shielding the mainstream search engine behavior. But Dayu still have to remind Seoer in doing outside the chain, should not first query robots.txt file, lest your efforts in vain.

After killing two: Nofollow

Do SEO to nofollow must be not unfamiliar, nofollow is the <a> tag Rel property value, which allows access to the value of the HREF attribute, allow the index, display results, but do not pass the PR value, that is not to pass the weight. Dayu today in A5 see a post said a well-known Webmaster forum on the signature link added nofollow, after verification, pure rumors. But visible stationmaster to nofollow of panic. Do not pass the weight of the outside chain is meaningless, more well-known is NetEase blog set up nofollow.

Killer three: Js/ajax

This is especially important for us to make links to friends. This kind of JS or Ajax asynchronous call link is meaningless. But we webmaster in do friend chain often lax guard, just look at each other on the other side of the Web site is the existence of their own links. In fact, through the Professional Friendship link detection tool or check the page source file URL is included in the tag can be easily identified.

Killer four: Inframe

This is actually another fake chain of disguise, and JS calls exactly the same. The difference is just that the link is there, but not on the other side of the home page or links pages. The recognition method is the same as the JS false chain.

In fact, these files, tags, or technology itself is not to block or block links. Just different people, different eyes to make it become our outer chain of stealth killer, do SEO to beware. Article original, reproduced please indicate the source 788 China door and window curtain wall Talent network http://www.788job.net, thank you.