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“网站变灰”背后的代码实现

  • 2026-04-06 04:09:42
“网站变灰”背后的代码实现

在刚刚过去的几个月里,我们的国家经历了非常惨痛的时刻,很多英雄在救助和保护他人的路上倒下。前天(4月4日),清明节,全国降半旗,10点全国默哀三分钟,以致敬英雄和缅怀逝去的同胞们。当天一切公共娱乐活动也都停止,包括直播、综艺、影视、游戏等等。

在这里也向全国抗击新冠肺炎疫情斗争牺牲的烈士和逝世的同胞表达深切的哀悼,向所有在抗战在疫情前线的工作和医护人员致敬。我们每一个人的平安面前,都是英雄的人墙。

网站变灰

为了表示哀悼,当天很多网站把主页和内容都变成了灰色,比如百度、B 站、爱奇艺、CSDN 等等。

CSDN
爱奇艺
百度

全站的内容都变成灰色了,包括按钮、图片等等。这时候有人可能会好奇,这是怎么做到的呢?

有人会以为所有的内容都修改了代码,统一换了一个 CSS 样式,图片也全换成灰色的了,按钮等样式也统一换成了灰色样式。但想想看这个成本也太高了,而且万一某个控件忘记加灰色样式了岂不是太突兀了。

其实,解决方案很简单,只需要几行代码就能搞定了。

实现

我们选择一个网站,比如 B 站吧,打开浏览器开发者工具。

审查一下网页的源代码,我们可以发现在 html 的这个地方多了一个疑似的 class,叫做 gray,gray 中文即灰色。

变灰效果

其 CSS 内容为:

html.gray {-webkit-filter: grayscale(.95);}

我们将其取消,就能发现网站的颜色就能重新还原回来了。

还原效果

果然是这个样式在起作用,而且是全局的效果,因为它是作用在了 html 这个节点之上的。

另外看看 CSDN,它也是用的这个 CSS 样式,其内容为:

html {-webkit-filter: grayscale(100%);-moz-filter: grayscale(100%);-ms-filter: grayscale(100%);-o-filter: grayscale(100%);    filter: grayscale(100%);    filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);}

这个实现看起来兼容性会更好一些。

因此我们可以确定,通过一个全局的 CSS 样式就能将整个网站变成灰色效果。

分析

那么这里我们就来详细了解一下这究竟是一个什么样的 CSS 样式。

这个样式名叫做 filter,搜下 MDN 的官方介绍,其链接为:https://developer.mozilla.org/zh-CN/docs/Web/CSS/filter。

官方介绍内容如下:

filter CSS 属性将模糊或颜色偏移等图形效果应用于元素。滤镜通常用于调整图像,背景和边框的渲染。

CSS 标准里包含了一些已实现预定义效果的函数。你也可以参考一个 SVG 滤镜,通过一个 URL 链接到 SVG 滤镜元素 (SVG filter element[1])。

其实就是一个滤镜的意思。

官方有一个 Demo,可以看下效果,如图所示。

Demo

比如这里通过 filter 样式改变了图片、颜色、模糊、对比度等等信息。

其所有用法示例如下:

/* URL to SVG filter */filter: url("filters.svg#filter-id");/* <filter-function> values */filter: blur(5px);filter: brightness(0.4);filter: contrast(200%);filter: drop-shadow(16px16px20px blue);filter: grayscale(50%);filter: hue-rotate(90deg);filter: invert(75%);filter: opacity(25%);filter: saturate(30%);filter: sepia(60%);/* Multiple filters */filter: contrast(175%) brightness(3%);/* Global values */filter: inherit;filter: initial;filter: unset;

各个用法介绍大家可以参考官方的文档说明:https://developer.mozilla.org/zh-CN/docs/Web/CSS/filter

比如这里如果我们可以使用 blur 设置高斯模糊,用法如下:

filter: blur(radius)

给图像设置高斯模糊。radius 一值设定高斯函数的标准差,或者是屏幕上以多少像素融在一起,所以值越大越模糊;如果没有设定值,则默认是 0;这个参数可设置绝对像素值,但不接受百分比值。

可以达成这样的效果:

效果

再说回刚才的灰色图像,这里其实就是设置了 grayscale,其用法如下:

filter: grayscale(percent)

将图像转换为灰度图像。值定义转换的比例。percent 值为 100% 则完全转为灰度图像,值为 0% 图像无变化。值在 0% 到 100% 之间,则是效果的线性乘子。若未设置,值默认是 0。另外除了传递百分比,还可以传递浮点数,效果是一样的。

如:

filter: grayscale(1)filter: grayscale(100%)

都可以将节点转化为 100% 的灰度模式。

所以一切到这里就清楚了,如果我们想要把全站变成灰色,再考虑到各浏览器兼容写法,可以参考下 CSDN 的写法:

.gray {-webkit-filter: grayscale(100%);-moz-filter: grayscale(100%);-ms-filter: grayscale(100%);-o-filter: grayscale(100%);    filter: grayscale(100%);    filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);}

这样想要变灰的节点只需要加上 gray 这个 class 就好了,比如加到 html 节点上就可以全站变灰了。

最后呢,看一下浏览器对 filter 这个样式的兼容性怎样,如图所示:

兼容性

这里我们看到,这里除了 IE,其他的 PC、手机端的浏览器都支持了,Firefox 的 PC、安卓端还单独对 SVG 图像加了支持,可以放心使用。

总结

本篇文章简单介绍了一下“网站变灰”效果的实现,也学习了 filter 的更详细的用法。

References

[1] SVG filter element: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/filter

作者:崔庆才

来源:进击的Coder


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  1. CONNECT:[ UseTime:0.000573s ] mysql:host=127.0.0.1;port=3306;dbname=g_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000851s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000292s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000638s ]
  6. SELECT * FROM `set` [ RunTime:0.000241s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000732s ]
  8. SELECT * FROM `article` WHERE `id` = 458131 LIMIT 1 [ RunTime:0.002738s ]
  9. UPDATE `article` SET `lasttime` = 1775551405 WHERE `id` = 458131 [ RunTime:0.006449s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000790s ]
  11. SELECT * FROM `article` WHERE `id` < 458131 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000518s ]
  12. SELECT * FROM `article` WHERE `id` > 458131 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004965s ]
  13. SELECT * FROM `article` WHERE `id` < 458131 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003073s ]
  14. SELECT * FROM `article` WHERE `id` < 458131 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003663s ]
  15. SELECT * FROM `article` WHERE `id` < 458131 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012918s ]
0.109277s