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带宽下载速度之间单位换算

1 byte = 8 bits 1 kilobit per second (kbps) = 1000 bits per second (bps) 1 megabit per second (Mbps) = 1000 kilobits per second (kbps) 1 gigabit per second (Gbps) = 1000 megabits per second (Mbps) To convert download speed in Mbps to download size in megabytes (MB), divide by 8: 1 Mbps = 0.125 MB/s To convert download size in MB to download time in seconds, divide download size by download speed: Download time = Download size / Download speed Note: Actual download speeds may vary due to network conditions, server load, and other factors.

Public @ 2023-04-12 12:50:38

经典正则表达式

正则表达式用于字符串处理，表单验证等场合，实用高效，但用到时总是不太把握，以致往往要上网查一番。我将一些常用的表达式收藏在这里，作备忘之用。本贴随时会更新。匹配中文字符的正则表达式： [\u4e00-\u9fa5]匹配双字节字符(包括汉字在内)：[^\x00-\xff]应用：计算字符串的长度（一个双字节字符长度计2，ASCII字符计1）String.prototype.len=function()

Public @ 2011-01-03 16:14:32

个人网站如何进行备案

网站备案是根据国家法律法规需要网站的所有者向国家有关部门申请的备案，主要有ICP备案和公安局备案。网站备案的目的就是为了防止在网上从事非法的网站经营活动，打击不良互联网信息的传播，如果网站不备案的话，很有可能被查处以后关停。每个省的备案条件都都有不同，有的条件甚至恰恰相反，备案条件有的省严格，有的省宽松，对于个人用户来说，你的户口在哪个省，就用哪个省的条件备案，运气好的话备案其实也不算难。下面是以

Public @ 2009-04-06 15:46:04

WEB站点性能优化实践（加载速度提升2s）

感谢大CC的投稿：进行优化前，关键是剖析当前的web性能，找到性能瓶颈，从而确定最需改进的地方;如果精力有限，首先将精力放在能明显提升性能的改进点上;《高性能网站建设指南》提出了一个性能黄金法则：只有10%-20%的最终用户响应时间花在了下载HTML文档上;其余的80%-90%的时间花在了下载页面中的所有组件上。由于本文将实施一个完整的优化流程，所以，我们还是从后台开始;案例说明：优化之前的网站规

Public @ 2011-10-26 15:37:11

JavaScript如何影响网站加载速度

当考虑到移动网站排名的时候，我们通常第一个想到的因素就是网站的加载速度。而加快网站加载速度的方式，通常第一个想到的都是从图片的大小入手，这确实非常有效，但是我们经常忽略的影响一个网站加载速度的因素就是JavaScript,这个几乎出现于每个页面代码中的语言。在网站的代码中，HTML(超文本标记语言)控制网页的结构和内容;CSS(层叠样式表)控制站点在不同设备上的外观和展现形式;JavaScript

Public @ 2009-02-09 15:37:09

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[ DB ] CONNECT:[ UseTime:0.024015s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.017153s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 7129 LIMIT 1 [ RunTime:0.016233s ]
[ 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:0.016349s ]
[ 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:0.016586s ]
[ 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:0.017191s ]
[ 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` = 7129 LIMIT 1 [ RunTime:0.016409s ]
[ 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=7129 [ RunTime:0.017758s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海网站建设' AND `status` <> -1 LIMIT 1 [ RunTime:0.022211s ]
[ 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` = '威海网站建设' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.058180s ]
[ 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` = '威海网站访问速度' AND `status` <> -1 LIMIT 1 [ RunTime:0.023953s ]
[ 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` = '威海网站访问速度' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.040189s ]
[ 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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