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本文来源:曼朗 发布时间:2015-06-16 分享:
口碑营销公司介绍搜索引擎按覆盖范围可分为通用搜索引擎和专业性搜索引擎。按引擎功能可分为常规搜索引擎(或称独立搜索引擎)和多元搜索引擎(或称宏搜索引擎)两大类。常规搜索引擎有单一的功能,搜索时通常只检索自己的数据库,并根据数据库内容反馈出相应的查询信息或链接站点。做网站SEO优化的都知道,多元搜索引擎是多个单一引擎的组合,对同一个查询可同时在多个搜索引擎上查询,或组合指定的搜索引擎查询,或在单一搜索引擎上查询,但可综合输出查询结果,也可分别输出每个搜索引擎的查询结果。
口碑营销公司介绍Pagerank是internet上网页重要性的评估标准,它是基于网页中相互链接关系的分析得出的,哪个网页被链接得多,哪个网页的pagepank值就高。但搜索引擎的评估标准应达到查全率和查准率的和谐统一,因此搜索引擎的技术提出通过搜索引擎的相关性定律、人气质量定律、自信心定律来评价搜索引擎,口碑营销公司介绍将搜索引擎的具体评价指标分为数据库规模和内容、索引方法、检索功能、检索结果、用户界面和其他等六个指标,以上由上海网络推广曼朗小编整理。
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