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RobotsMETA标签的写法

Robots META标签中没有大小写之分，name="Robots"表示所有的搜索引擎，可以针对某个具体搜索引擎写为name="BaiduSpider"。 content部分有四个指令选项:index、noindex、follow、nofollow，指令间以","分隔。

INDEX 指令告诉搜索机器人抓取该页面;

FOLLOW 指令表示搜索机器人可以沿着该页面上的链接继续抓取下去;

Robots Meta标签的缺省值是INDEX和FOLLOW，只有inktomi除外，对于它，缺省值是INDEX,NOFOLLOW。

这样，一共有四种组合:

<META NAME="ROBOTS" CONTENT="INDEX,FOLLOW">

<META NAME="ROBOTS" CONTENT="NOINDEX,FOLLOW">

<META NAME="ROBOTS" CONTENT="INDEX,NOFOLLOW">

<META NAME="ROBOTS" CONTENT="NOINDEX,NOFOLLOW">

其中

<META NAME="ROBOTS" CONTENT="INDEX,FOLLOW">可以写成<META NAME="ROBOTS" CONTENT="ALL">;

<META NAME="ROBOTS" CONTENT="NOINDEX,NOFOLLOW">可以写成<META NAME="ROBOTS" CONTENT="NONE">

目前看来，绝大多数的搜索引擎机器人都遵守robots.txt的规则，而对于Robots META标签，目前支持的并不多，但是正在逐渐增加，如著名搜索引擎GOOGLE就完全支持，而且GOOGLE还增加了一个指令"archive"，可以限制GOOGLE是否保留网页快照。例如:

<META NAME="googlebot" CONTENT="index,follow,noarchive">

表示抓取该站点中页面并沿着页面中链接抓取，但是不在GOOLGE上保留该页面的网页快照。

来源：360站长平台

Public @ 2019-11-07 16:09:03

玩转robots协议

2013年2月8日北京市第一中级人民法院正式受理了百度诉奇虎360违反“Robots协议”抓取、复制其网站内容的不正当竞争行为一案，索赔金额高达一亿元，这可以看做2012年下半年“3B大战”的继续。在此次索赔案件中，百度称自己的Robots文本中已设定不允许360爬虫进入，而360的爬虫依然对“百度知道”、“百度百科”等百度网站内容进行抓取。其实早在2012年11月初，针对双方摩擦加剧的情况，在中

Public @ 2019-05-13 16:09:21

Nofollow属性的介绍和使用

什么是Nofollow？我们知道，反向链接是Google PR值的主要计算指标。为了添加反向链接，SEO作弊者在论坛和博客等大量发布带无关链接的内容。这些垃圾链接的存在给搜索引擎对网页质量的评估造成一定程度的麻烦。Nofollow 正是Google、Yahoo、MSN 为了应对垃圾链接（Spam）引入的一个属性，此属性目前应该被广泛采用。如果A网页上有一个链接指向B网页，但A网页给这个链接加上了

Public @ 2012-07-18 16:08:51

robots.txt文件放在哪里?

robots.txt文件应该放在网站根目录下。举例来说，当robots访问一个网站时，首先会检查该网站中是否存在这个文件，如果机器人找到这个文件，它就会根据这个文件的内容，来确定它访问权限的范围。

Public @ 2019-06-21 16:09:32

robots使用技巧

1. 每当用户试图访问某个不存在的URL时，服务器都会在日志中记录404错误(无法找到文件)。每当搜索蜘蛛来寻找并不存在的robots.txt文件时，服务器也将在日志中记录一条404错误，所以你应该在网站中添加一个robots.txt。2. 网站管理员必须使蜘蛛程序远离某些服务器上的目录--保证服务器性能。比如:大多数网站服务器都有程序储存在"cgi-bin"目录下，因此在ro

Public @ 2009-05-16 16:09:17

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基本文件流程错误 SQL 调试

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[ SQL ] SHOW COLUMNS FROM `ob_config` [ RunTime:0.017788s ]
[ SQL ] SELECT * FROM `ob_config` [ RunTime:0.016818s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_config', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 25, 'extra' => NULL, ) ]
[ SQL ] SHOW COLUMNS FROM `ob_hook` [ RunTime:0.017756s ]
[ SQL ] SELECT `id`,`name`,`addon_list` FROM `ob_hook` [ RunTime:0.016742s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_hook', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 3, 'extra' => NULL, ) ]
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.017855s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 4392 LIMIT 1 [ RunTime:0.016942s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='cate' order by times desc limit 15 [ RunTime:0.017223s ]
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[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by times desc limit 100 [ RunTime:0.017763s ]
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[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by rand() limit 30 [ RunTime:0.017709s ]
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[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 4392 LIMIT 1 [ RunTime:0.016789s ]
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[ SQL ] update `ob_article` set views=views+1 where id=4392 [ RunTime:0.017674s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海网站结构优化' AND `status` <> -1 LIMIT 1 [ RunTime:0.023563s ]
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[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海Robots' AND `status` <> -1 LIMIT 1 [ RunTime:0.024476s ]
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[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海Robots' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.033546s ]
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