Http://www.aliyun.com/zixun/aggregation/8495.html "> links are links to each other on their website. Must be able to find the Web site and the name of the site in the code, and browsing the Web site can display the name of the website, this is called friendship links. Now there are a lot of so-called cheat links, just the other side of the site in the JS code or IFRAME inside, such links can not be called friendship links, because such links to the webmaster, there is no meaning.
The benefits of links are not the amount of direct traffic you can bring to your site, but the fact that it will allow search engines to include more of your Web pages. Authoritative survey shows that 80% of the world's web sites, their visits 70%-90% are from search engines, so, let search engines include more pages, is to improve the number of Web site visits the most effective way.
Link popularity, is the site to do the number of linked sites, search engine rankings to consider a very important factor. That is, the greater the number of site links, the higher the rank.
Before exchanging the connection, must learn to recognize the authenticity first! There are a lot of tricks here, you chain he is equal to white chain, a lot of webmaster through the Friendship Link Group QQ, active application, advertising cooperation and other means of hard to exchange links, but someone is not want their own site links appear other links through a variety of means to cheat, How to set up the following links to tell us how to cheat common methods:
1. Use JS statement to output link code or use I to include link page
Because the vast majority of search engines do not crawl, analysis of the ability of JS statements, so, through the output of JS link code, search engines can not crawl to, at the same time, search engine and can not be very good to crawl the content of I, so the use of I contains links to the link between the form of Both of these links are invalid links, a simple way to Judge view the source file of the other link page, if you can not find your page address, it should be the above 2 ways to output the link, there is an exception, the page directly using the JS statement output link, such as write ' [a href=http://www.heimalink.com/ref= Nofollow]seo Optimization [/A] ' such form, is also a JS statement, but the page can be found, such links, in theory, search engines will crawl to the But whether it equates to a common link is an unknown.
2, if the other side of the site for you to do the Friendship link directory under the robots.txt. and have disallow:/have links directory name/. Tell the spider not to go to the index in the directory with links to any file. Do not exchange links with the two sides. Check to see if there is any robots.txt. If not, then add/robots.txt to the site. If not, it means he doesn't define robots.txt.
3, Links page in the IFRAME frame.
Framework call link scam, cheat is on the home page and you exchange links, and his station PR is much higher than you, as the saying goes, there is no free lunch at this time you should pay attention to see his exchange of links is not in the framework, not directly in the first document, the general framework of the links are in the IFRAME tag, and call from another file, the eyes look like you have links on his web page, and you can click on the link to your site, but in fact this link is not useful, because in the IFRAME framework, so the search engine is not recognized, you can view the source of his web page view, See is not in his source code has a link to your site, if you can not find the general do not exchange with him do not exchange links with him. Because the search can not grasp the contents of the IFRAME.
4, the Friendship link area uses the nofollow attribute
Google launched the Nofollow label is intended to better control the page's external links to create the loss of the page's PR, but at present, this attribute is also an ulterior motive applied to the friendship connection, these people's friendship links at first glance no problem, but view the source of the page, You will find that the link code is in this form [a href= "http://www.tao536.com/" ref= nofollow]seo optimized [/a], with more of this nofollow attribute, the PR of the page will not be passed, Although Baidu currently does not support this attribute, but the value of this link has been greatly reduced. As in the third case, the way to prevent this kind of deception is to look at the source file and see if there is such a property in the linked statement
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