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JavaScript鏈接的作用

由于JavaScript可以創(chuàng)造很多吸引人的視覺效果，有些網(wǎng)站喜歡使用JavaScript腳本生成導(dǎo)航。這也是嚴(yán)重的蜘蛛陷阱之一。

據(jù)觀察，有的搜索引擎在技術(shù)上可以獲得JavaScript腳本中包含的鏈接，甚至可以執(zhí)行腳本并跟蹤鏈接，但對(duì)權(quán)重低的網(wǎng)站，搜索引擎覺得沒必要，不會(huì)費(fèi)那個(gè)勁。所以網(wǎng)站上的鏈接必須使用最簡(jiǎn)單標(biāo)準(zhǔn)的HTML鏈接，尤其是導(dǎo)航系統(tǒng)。用CSS做導(dǎo)航同樣可以實(shí)現(xiàn)很多視覺效果。

JavaScript鏈接在SEO中也有特殊用途，那就是站長(zhǎng)不希望被收錄的頁(yè)面（如無排名意義的頁(yè)面，重復(fù)內(nèi)容頁(yè)面等），不希望徹底權(quán)重的鏈接，可以使用JavaScript腳本阻止搜索引擎爬行。

來源：搜外網(wǎng)

Public @ 2010-01-14 16:21:35

robots.txt使用教程

robots.txt 是一個(gè)文本文件，用于指示搜索引擎爬蟲哪些頁(yè)面可以被抓取，哪些頁(yè)面不應(yīng)該被抓取。在建立一個(gè)網(wǎng)站時(shí)，可以通過 robots.txt 控制搜索引擎爬蟲對(duì)網(wǎng)站的訪問，以達(dá)到更好的SEO效果。以下是robots.txt的使用教程。步驟1：新建 robots.txt 文件在網(wǎng)站的根目錄下，新建一個(gè)名為 robots.txt 的文本文件。步驟2：編輯 robots.txt 文件

Public @ 2023-04-18 01:00:34

sitemap都支持哪些格式?

支持XML格式和TXT文本格式。

Public @ 2018-09-08 16:11:57

訪問本頁(yè)面，您的瀏覽器需要支持JavaScript，怎么回事？

百度和google里面搜索我的站點(diǎn)，出現(xiàn)：“訪問本頁(yè)面，您的瀏覽器需要支持JavaScript”。到底怎么回事？比如：這幾天發(fā)現(xiàn)在百度和GOOGLE里搜索自己的站點(diǎn)時(shí)都顯示:訪問本頁(yè)面,您的瀏覽器需要支持JavaScript... 前幾天還是正常的,網(wǎng)頁(yè)都是純的HTML,根本不存在瀏覽器是否支持的問題,請(qǐng)問是什么原因造成的呢?答案：我進(jìn)行了一系列的分析，發(fā)現(xiàn)類似你這種情況的網(wǎng)站還很多。通過搜索“訪

Public @ 2017-06-14 16:14:01

JavaScript鏈接的作用

由于JavaScript可以創(chuàng)造很多吸引人的視覺效果，有些網(wǎng)站喜歡使用JavaScript腳本生成導(dǎo)航。這也是嚴(yán)重的蜘蛛陷阱之一。據(jù)觀察，有的搜索引擎在技術(shù)上可以獲得JavaScript腳本中包含的鏈接，甚至可以執(zhí)行腳本并跟蹤鏈接，但對(duì)權(quán)重低的網(wǎng)站，搜索引擎覺得沒必要，不會(huì)費(fèi)那個(gè)勁。所以網(wǎng)站上的鏈接必須使用最簡(jiǎn)單標(biāo)準(zhǔn)的HTML鏈接，尤其是導(dǎo)航系統(tǒng)。用CSS做導(dǎo)航同樣可以實(shí)現(xiàn)很多視覺效果。JavaS

Public @ 2010-01-14 16:21:35

更多您感興趣的搜索

基本文件流程錯(cuò)誤 SQL 調(diào)試

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[ DB ] CONNECT:[ UseTime:0.021134s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.015333s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 5303 LIMIT 1 [ RunTime:0.014414s ]
[ 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:0.014601s ]
[ 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:0.014678s ]
[ 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:0.014905s ]
[ 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` = 5303 LIMIT 1 [ RunTime:0.014310s ]
[ 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+1 where id=5303 [ RunTime:0.017579s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海網(wǎng)站結(jié)構(gòu)優(yōu)化' AND `status` <> -1 LIMIT 1 [ RunTime:0.021962s ]
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[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海網(wǎng)站結(jié)構(gòu)優(yōu)化' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.036246s ]
[ 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JavaScript' AND `status` <> -1 LIMIT 1 [ RunTime:0.021151s ]
[ 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JavaScript' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.032037s ]
[ 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', ) ]

0.419072s

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Categories

Tags

JavaScript鏈接的作用

robots.txt使用教程

sitemap都支持哪些格式?

訪問本頁(yè)面，您的瀏覽器需要支持JavaScript，怎么回事？

JavaScript鏈接的作用

更多您感興趣的搜索

国产成人精品999视频&日本一区二区亚洲人妻精品&久久久精品国产99久久精&99热这里只有成人精品国产&精品国产剧情av一区二区&成人亚洲精品久久久久app&国产精品美女高潮抽搐A片

Categories

Tags

JavaScript鏈接的作用

robots.txt使用教程

sitemap都支持哪些格式?

訪問本頁(yè)面，您的瀏覽器需要支持JavaScript，怎么回事？

JavaScript鏈接的作用

更多您感興趣的搜索

訪問本頁(yè)面，您的瀏覽器需要支持JavaScript，怎么回事？