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链接深度是什么

链接深度是指从某一页面开始往下浏览的页面层数。例如，从网站的首页，点进一个链接，从该链接进入了网站的第二层，此时的链接深度为2。链接深度有利于更好地理解网站的结构，也有助于搜索引擎优化等。

Public @ 2023-02-25 06:36:11

Nofollow是什么意思

a：使用<nofollow>属性的链接不会被搜索引擎跟踪，更不会给链接传递权重。避免权重不必要的丢失，从而达到权重集中的目的。

Public @ 2018-08-31 16:08:50

robots.txt文件有什么必要？

什么是robots.txt文件?搜索引擎机器人通过链接抵达互联网上的每个网页，并抓取网页信息。搜索引擎机器人在访问一个网站时，会首先检查该网站的根目录下是否有一个叫做robots.txt的纯文本文件。当我们的网站有一些内容不想被搜索引擎收录，我们可以通过设置robots.txt文件告知搜索引擎机器人。如果网站上没有禁止搜索引擎收录的内容，则不用设置robots.txt文件，或设置为空。robots

Public @ 2018-10-22 16:09:22

链接深度的具体作用

增加内页权重虽然，链接深度是网站的内部页面之间的链接，但如果这种内部链接达到一定的数量而且这一数量更是有质量的时候，那么网站内部页面的权重将会有极大的提升，随之而来的也是内部页面在搜索引擎搜索结果中排名的提升。有的时候我们可能会发现，某一网站内部页面在某一特定关键词下，在搜索引擎中排名会比首页要高得多，有可能就是这一页面的链接深度有“量”又有“质”造成的。增加首页权重由于网站的权重、PR值具有传递

Public @ 2016-06-12 16:11:34

链接深度是什么

链接深度是指从某一页面开始往下浏览的页面层数。例如，从网站的首页，点进一个链接，从该链接进入了网站的第二层，此时的链接深度为2。链接深度有利于更好地理解网站的结构，也有助于搜索引擎优化等。

Public @ 2023-02-25 06:36:11

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[ DB ] CONNECT:[ UseTime:0.021630s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.015656s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 5803 LIMIT 1 [ RunTime:0.014571s ]
[ 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:0.014907s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by times desc limit 100 [ RunTime:0.015062s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by rand() limit 30 [ RunTime:0.015629s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 5803 LIMIT 1 [ RunTime:0.014759s ]
[ 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 ] update `ob_article` set views=views+2 where id=5803 [ RunTime:0.017715s ]
[ 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:0.022166s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海网站结构优化' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.037488s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海链接深度' AND `status` <> -1 LIMIT 1 [ RunTime:0.024956s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海链接深度' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.031026s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

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