全文搜索引擎

　　在搜索引擎分类部分我们提到过全文搜索引擎从网站提取信息建立网页数据库的概念。搜索引擎的自动信息搜集功能分两种。一种是定期搜索，即每隔一段时间（比如Google一般是28天），搜索引擎主动派出“蜘蛛”程序，对一定IP地址范围内的互联网站进行检索，一旦发现新的网站，它会自动提取网站的信息和网址加入自己的数据库。

-Full-text search engine in the search engine classified part of our full-text search engine mentioned extract information from the Web page database to establish the concept. Search engine automatically at the two information-gathering function. One is the regular search, that is, from time to time (such as Google is generally 28 days), take the initiative to send a search engine　spider　program to certain IP addresses within the scope of Internet sites to search, once the discovery of new sites, it will automatically Extract site information and web site by adding their own database.