CSS阴影效果(Box-shadow)用法趣味讲解

向右看齐 2022-08-05 02:23 153阅读 0赞

使用Box-shadow属性表现阴影效果是现代浏览器中是一个非常有用的技巧，通过它我们可以做出很多非常酷的东西。让我们来一步一步的了解box-shadow属性的基本用法，然后进一步了解::before和::after伪元素的用法。

基本用法

[![105135nqd9q2i9gd3kab9q.png][]][105135nqd9q2i9gd3kab9q.png]

[![1052111l19prtple9fb7fq.png][]][1052111l19prtple9fb7fq.png]

box-shadow:2px 2px 5px \#000;

[![105241hfwwkhffwga4k7fr.png][]][105241hfwwkhffwga4k7fr.png]

box-shadow:0px 0px 10px \#000;

内阴影

[![105328yjul3zuw6l91l9qz.png][]][105328yjul3zuw6l91l9qz.png]

[![1053518fyz6xszc96jj6yy.png][]][1053518fyz6xszc96jj6yy.png]

box-shadow:inset 2px 2px 5px \#000;

阴影扩展长度值

[![105430nuku9tsgn0616oeu.png][]][105430nuku9tsgn0616oeu.png]

[![105453ssoqd9odhto73zym.png][]][105453ssoqd9odhto73zym.png]

box-shadow:0px 0px 5px 10px \#000;

[![105522ym22jav2yh2um2o4.png][]][105522ym22jav2yh2um2o4.png]

box-shadow:0px 15px 10px -15px \#000;

[![1055588afmy80hhvjzs9jd.png][]][1055588afmy80hhvjzs9jd.png]

box-shadow:inset 0px 15px 10px -15px \#000;

多重阴影

[![105650qrtutzhz00sn8h5u.png][]][105650qrtutzhz00sn8h5u.png]

box-shadow:0px 0px 0px 3px \#bb0a0a, 0px 0px 0px 6px \#2e56bf, 0px 0px 0px 9px \#ea982e;

伪元素::before和::after的乐趣

使用伪元素::before和::after，我们能创造出非常逼真的只有图片才能实现的阴影效果。让我来看一个例子：

[![105736ep6evveh995ieg11.png][]][105736ep6evveh995ieg11.png]

.box11 \{ width: 300px; height: 100px; background: \#ccc; border-radius: 10px; margin: 10px; \} .shadow \{ position: relative; max-width: 270px; box-shadow: 0px 1px 4px rgba(0,0,0,0.3), 0px 0px 20px rgba(0,0,0,0.1) inset; \} .shadow::before, .shadow::after \{ content:""; position:absolute; z-index:-1; \} .shadow::before, .shadow::after \{ content:""; position:absolute; z-index:-1; bottom:15px; left:10px; width:50%; height:20%; \} .shadow::before, .shadow::after \{ content:""; position:absolute; z-index:-1; bottom:15px; left:10px; width:50%; height:20%; box-shadow:0 15px 10px rgba(0, 0, 0, 0.7); transform:rotate(-3deg); \} .shadow::after\{ right:10px; left:auto; transform:rotate(3deg); \}

[105135nqd9q2i9gd3kab9q.png]: http://www.html5cn.org/data/attachment/portal/201411/25/105135nqd9q2i9gd3kab9q.png
[1052111l19prtple9fb7fq.png]: http://www.html5cn.org/data/attachment/portal/201411/25/1052111l19prtple9fb7fq.png
[105241hfwwkhffwga4k7fr.png]: http://www.html5cn.org/data/attachment/portal/201411/25/105241hfwwkhffwga4k7fr.png
[105328yjul3zuw6l91l9qz.png]: http://www.html5cn.org/data/attachment/portal/201411/25/105328yjul3zuw6l91l9qz.png
[1053518fyz6xszc96jj6yy.png]: http://www.html5cn.org/data/attachment/portal/201411/25/1053518fyz6xszc96jj6yy.png
[105430nuku9tsgn0616oeu.png]: http://www.html5cn.org/data/attachment/portal/201411/25/105430nuku9tsgn0616oeu.png
[105453ssoqd9odhto73zym.png]: http://www.html5cn.org/data/attachment/portal/201411/25/105453ssoqd9odhto73zym.png
[105522ym22jav2yh2um2o4.png]: http://www.html5cn.org/data/attachment/portal/201411/25/105522ym22jav2yh2um2o4.png
[1055588afmy80hhvjzs9jd.png]: http://www.html5cn.org/data/attachment/portal/201411/25/1055588afmy80hhvjzs9jd.png
[105650qrtutzhz00sn8h5u.png]: http://www.html5cn.org/data/attachment/portal/201411/25/105650qrtutzhz00sn8h5u.png
[105736ep6evveh995ieg11.png]: http://www.html5cn.org/data/attachment/portal/201411/25/105736ep6evveh995ieg11.png