了解：掌握SEO：搜索引擎抓取及收录排名原理2024/5/20

情非得已

　　上一篇文章说到有关于关键词排名的三大因素是哪些。现在我们延伸主题内容，说说在做SEO时，不光需要知道关键词排名的关键内容，还需要了解搜索引擎的抓取和排名原理是什么？这样才能更加透彻的明白SEO，并做好排名。

　　一、搜索引擎抓取

　　蜘蛛抓取的过程是：

　　DNS解析——〉TCP连接——〉发送HttpGet请求——〉读取、解析HttpHeader信息——〉提取出页面超链接，处理放入待抓队列——〉读取页面数据

　　DNS解析：其实就是域名解析，是把域名指向网站空间IP地址，找到对应网站。

　　TCP连接：当TCP连接成功，我们就可以获取到向服务器HTTP请求的数据。

　　发送HttpGet请求：用GET方式的请求HTTP协议。HTTP是基于TCP/IP的关于数据如何在万维网中如何通信的协议。

　　读取、解析HttpHeader信息：从http的header中取得信息。

　　1、定期抓取：周期性抓取网页内容

　　2、增量抓取：抓取流量大的页面

　　3、分类抓取：抓取更新频率高的页面

　　二、搜索引擎收录及排名原理

　　搜索引擎排名=提取页面+去噪处理+提取正文+分词切词+建立关键词索引+页面权重

　　页面权重值=页面相关性+内外链接+用户行为

　　页面相关性=关键词匹配度+关键词密度+关键词分布

　　用户行为=用户体验度+跳出率

　　总结：关键词排名的要素和搜索引擎的原理是一致，只要做好这三部分，绝对是没有问题。其实从文章中能看出来，道理是相通，基本原理也是固定的，只要抓住要领，肯定是可以做好的。

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