I have been working on website and product promotion these days, and there are many things I don’t understand, but among the things I promote, many nouns are very attractive to me. The first is SEO. In the process of understanding SEO, I came across "external links". When I was learning about external links, I encountered "spider crawling". I received so much information at once. It felt amazing. SEO is indeed not simple.
And today I want to talk to you about the word "spider crawling". I believe I am not the first to mention it, because I am a latecomer, but I hope that my description can help more people understand this word. After all, many professional introductions are quite professional, and because they are too professional, It feels incomprehensible.
First, let’s introduce Baidu inclusion. There are many, many websites in the online world, and the websites contain countless web pages, just like us, with a population of more than 6 billion. Well, some people are very influential in the world, such as Jackie Chan, Bruce Lee, Michael Jackson, etc., but unknown people like us are so humble. Those who have made great contributions to the world will naturally become famous, so I can put it in other words, those who "contribute" on the Internet will be included by Baidu. What is included is its network address and is included by Baidu. If The prestige of being included means that you may appear on the headlines of Baidu search, and headlines always attract much attention. It is precisely because everyone wants to compete for this position that SEO (search engine optimization) was born.
Then, the collected content is put into a library in an orderly manner, and this library has a good name "database" in the online world. As for the principle of the database, I won't go into details. Here you can mainly understand It is something that saves or records data in a certain format. "Spider Crawl" uses this stuff. Let me tell you about the "spider" again. Of course it is not the spider we see every day. Simply put, it is a computer program. The process of crawling is the process of implementing the algorithm (as for the term, it cannot be simply understood as the daily arithmetic process. It The meaning is equivalent to the planning process of an event). Recently, it seems that Baidu has changed its search algorithm, but let everyone slowly understand how to change it.
"Spider crawling" is a bit more figurative. There are vertical crawling and horizontal crawling, which are depth traversal and breadth traversal in our computer terms. The traversed content is large and small websites or web pages. After traversing, the spider actively downloads the web page and then downloads it. The returned web pages are calculated through various programs before being placed in the search area. Only then will a stable ranking be formed. Then they will be included in Baidu's database and finally displayed on Baidu's web page. And here, Baidu sent not just one "spider", but multiple, maybe ten, or hundreds, thousands, or even tens of thousands, or hundreds of thousands. In short, there must be a lot of them, and sending spiders Here's the computer term: threads. Obviously, multiple spiders are multiple threads, and only when multiple threads perform searches will the efficiency be high. When multiple "spiders" search together, it is a broad search. When one "spider" follows a certain rule, it is a deep search. The search for web pages is depth first and breadth first. When Baidu spider crawls the page, it crawls from the starting site (i.e., the seed site refers to some portal sites) with breadth first crawling in order to crawl more URLs, and depth first crawling. The purpose is to crawl high-quality web pages. This strategy is calculated and allocated by scheduling. Baidu Spider is only responsible for crawling. Weight priority refers to the priority crawling of pages with more reverse connections. This is also a type of scheduling. Strategy, generally speaking, 40% is the normal range for web crawling, 60% is considered good, and 100% is impossible. Of course, the more crawled, the better. In the process of learning, I came across an article introducing the safety of spider crawling. It introduced that spiders generally prefer to traverse those websites and will automatically avoid network vulnerabilities to avoid falling into them. This is very attractive to me. Yes, I remember the introduction in this article: traverse static websites first, because there may be an infinite loop in dynamic websites, so spiders cannot get out after entering. However, the general spider search process will first check the security of the website and find that These destructive actions will be avoided. I think this is worth considering. In the process of building a dynamic website, you must be strict with your program code to avoid website vulnerabilities. In the end, no spiders dare to enter.
That’s all for today’s introduction. There are many shortcomings. I hope you will correct me! Please bring the reprint to: Asia Ceramics Mall: www.asiachinachina.com
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