currently are recognized, and use more popular is the use of robots.txt and nofollow, the specific details and use your own love Shanghai OK, especially how to make good use of them, link weight to effectively guide page. Personal feeling:
said here to guide is to guide the spider, the spider told the limited power, the focus of which pages crawl, which pages are not important, so you can make your site according to the weight distribution to your website the limited power of spider crawling in the limited time the page number and page quality. So now many large forums, such as NetEase, because the update frequency is very high, in order to guide the spider crawling mainly high quality pages, rather than just updated posts, so the new posts were added nofollow.
robots.txt can prevent the included, but can not stop the transfer of weight
Now the search engine
nofollow can prevent the transfer of weight / from this page to grab, but can not stop by
foreign chain control is more and more strict, and the love of Shanghai Google has updated the algorithm, especially foreign chain junk the chain increased crackdown, has been outside the chain for the emperor is also need to think again, however in fact the chain is very important, especially outside the chain of high quality brings the effect is still very strong, and the chain or should do, is only for the requirements of the control is not like the original random.
of course, if your site update is not so big, it is not for new posts and nofollow, increase the website is the key.
nofollow can not effectively control the weight.
well, the problem of the chain is after, later, there is also talk about page weight transfer problems, the chain difficult, difficult to write original, so that the weight for the control station is to cherish the serious, how to control the weight of the existing site, let it have to take place.? today is that this is a personal opinion, for reference only, please indicate the source 贵族宝贝yy.haitianhome贵族宝贝, thank you.
so in general can be two methods together, to control a page link weight guide, but because the search engine does not clearly indicate that the nofollow is given out links to save weight, there is no distribution to other links, so that the use of nofollow to save weight is not necessarily effective use of nofollow more useful guide.
PS: noble baby (Unofficial) showed that over weight nofollow down and not saved, just lose love; Shanghai, nofollow weight down is allocated to other links.