What are the common black chain codes

Absrtact: I have written before about the definition and harm of black chain, which introduces the definition of black chain in SEO, and the effects of using it. Next, I would like to further analyze some of the common black chain code, so that you can deepen the

I've written an article on the definition and harm of black chain, which introduces the definition of black chain in SEO, and the effect of using it. Next, I would like to further analysis of some common black chain code, so that you can deepen the understanding of the black chain, but also to their own site is hung black chain has a better way to troubleshoot.

The first is the use of CSS to achieve black chain

<div style= "Position:absolute; top:-1000px;right:-1000px ">

<a href= "http://www.xxx.com" > Black chain </a>

</div>

This approach is to define the CSS location properties, so that the black chain's div away from the screen. The above code is the implementation of the div layer defined to the top right corner of the screen 1000px position. Black chain to a place we can not browse, we are not see, but the search spider just put it when the general code to read, will judge it is an effective link.

The second is the use of DIV+JS to achieve the black chain

<div id= "Heilian" >

<a href= "http://www.xxx.com" > Black chain </a>

</div>

<scriptlanguage=javascript>

document.getElementById ("Heilian"). style.display= "None" </script>

This is a div and JS combined to do a black chain of a common method. Spiders generally do not read <script> content, will only read the div in the link, but the display of Div attributes are script control, so the spider was fooled. For example, the above code, is through the script control Heilian Display Properties (display= "None"), so that the Heilian layer in the browser does not display, so that the black chain is not seen, but was crawled to the effect.

The third is the use of HTML code to implement the black chain

<marquee height=2 width=2 scrollamount=5000 scrolldelay=5000>

<a href= "http://www.xxx.com" > Black chain </a></marquee>

This method is relatively simple, neither CSS, nor JS, direct HTML code can achieve the effect of invisible. The principle is to put the black chain in a small square with a length and width of 2, in the definition of this small square scrolling speed to extremely fast (the definition of speed is fast to if you are Superman can not see the extent), and the search engine is still silly thought is a common code, but also happy to take the links inside.

Black chain to achieve the method of more ruthless, but the above is some of the most common basic methods, I hope we have a general understanding of it, in addition to remind everyone better not to use, or the consequences of their own.

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