联想集团有限责任公司

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On: September 23, 2025

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联想集团有限责任公司（英语：Lenovo Group Ltd.；港交所：0992；港交所：80992（人民币结算）；OTCBB：LNVGY）是中国的一家跨国科技公司，成立于1984年，由中国科学院计算技术研究所投资20万元人民币、11名科学人员创立，当时的名称为“中国科学院计算所新技术发展公司”。1989年，更改为“联想计算机集团有限责任公司”。

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Spider

Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering).

Web search engines and some other websites use Web crawling or spidering software to update their web content or indices of other sites' web content. Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently.

Crawlers consume resources on visited systems and often visit sites unprompted. Issues of schedule, load, and "politeness" come into play when large collections of pages are accessed. Mechanisms exist for public sites not wishing to be crawled to make this known to the crawling agent. For example, including a robots.txt file can request bots to index only parts of a website, or nothing at all.

The number of Internet pages is extremely large; even the largest crawlers fall short of making a complete index. For this reason, search engines struggled to give relevant search results in the early years of the World Wide Web, before 2000. Today, relevant results are given almost instantly.

Crawlers can validate hyperlinks and HTML code. They can also be used for web scraping and data-driven programming.