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Not only did Google,yahoo in official documents also have similar emphasis:
1, the search engine analysis of Web content caused interference. 2, the impact of keyword density. 3, seriously hinder search engine crawl Web page. 4, the impact of the link generated by the page weight distribution, which is usually reflected in the PageRank.
The impact of crawling and linking weights can also be made up of outside the chain, but the first 2nd is not easy to save.
What is junk information? From the point of view of SEO is not only for search engine crawl analysis is useless, but also to the keyword density caused interference and other adverse information. Usually these "junk" information includes: ADS, copyright statements, a large number of export links, information unrelated to the content, and so on. We can throw all this rubbish into one or several. js files, thus reducing the material content of the page interference, improve keyword density, to the search engine to show the core content of the page.
If you are interested, next time I can share the whole Flash site SEO method.
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