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什么是死链

我们在打开网址时，有时会出现“访问的页面不存在”的提示，这是死链的一种最直白的表现方式：通过某个链接进来后发现打不开或者是404页面，那么这个链接就叫做死链。

Public @ 2023-01-12 15:56:21

Alt文字的重要性

图片alt属性是搜索引擎唯一能识别的图片信息，因此，在优化网站时，尽可能利用alt属性阐述图片的主题内容，但是又要避免关键词的重叠堆砌，该图片属性作用也不仅仅告诉搜索引擎图片的主要信息，另外在图片出现加载失败时，还能够让访客理解图片所阐述的内容！用来对网页上的图片进行描述，光标在图片上时显示的提示语即采用该标签实现。从SEO和用户体验来看，ALT-代替属性都是必要的，其重要性主要有：网页内容相关性

Public @ 2022-10-09 15:16:45

相关词是布局核心，1个例子讲清Title！

Title是网页中最重要的元素之一，也是页面布局中的核心之一。Title通常位于HTML文档的标签中，用来说明网页的标题或名称。例如，在一个新闻网站中，标题可以是新闻标题或文章标题。通过设置合适的标题，可以让用户更快地找到自己感兴趣的内容。同时，标题也是搜索引擎优化的重要因素之一，优秀的标题可以提高网站在搜索引擎中的排名。在网页布局中，Title通常位于浏览器的标题栏或标签栏上。同时，Ti

Public @ 2023-04-11 20:00:58

死链示例展示中，死链链接、死链前链、锚文本、发现时间分别代表什么含义

1. 死链链接：指已经失效的链接，即指向的网页已经不存在或无法访问的链接。 2. 死链前链：指指向死链的链接，即在该链接中包含了已经失效的链接。 3. 锚文本：指点击该文本可以跳转到指定链接的文本，一般是链接所在的文字描述。 4. 发现时间：指发现该死链的时间，一般是指爬虫程序或网站管理员发现该链接无效的时间。

Public @ 2023-06-24 01:00:07

死链是如何形成的

值得注意的是，死链接并不是错误链接，错误链接是由于用户输入网址错误而根本不存在的链接。死链接则并不出一出现就是“死”的，它是曾经正常的链接，由于某种原因导致现在失效的链接。

Public @ 2019-02-26 15:56:20

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基本文件流程错误 SQL 调试

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[ DB ] CONNECT:[ UseTime:0.021702s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.015540s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 3189 LIMIT 1 [ RunTime:0.014594s ]
[ 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:0.014965s ]
[ 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:0.015121s ]
[ 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:0.015162s ]
[ 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` = 3189 LIMIT 1 [ RunTime:0.014608s ]
[ 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=3189 [ RunTime:0.015256s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海网站页面优化' AND `status` <> -1 LIMIT 1 [ RunTime:0.021558s ]
[ 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` = '威海网站页面优化' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.032467s ]
[ 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` = '威海死链' AND `status` <> -1 LIMIT 1 [ RunTime:0.021678s ]
[ 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` = '威海死链' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.030466s ]
[ 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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