如何使用纯CSS实现抽象的水波荡漾的动画（附源码）

效果预览

源代码下载

https://github.com/comehope/front-end-daily-challenges

代码解读

定义 dom，容器中包含 9 个元素：

<div class="container">    <span></span>    <span></span>    <span></span>    <span></span>    <span></span>    <span></span>    <span></span>    <span></span>    <span></span></div>

居中显示：

body {    margin: 0;    height: 100vh;    display: flex;    align-items: center;    justify-content: center;    background-color: black;}

定义容器尺寸：

.container {    width: 30em;    height: 30em;    font-size: 10px;}

用 grid 布局把 9 个子元素排列成 3 * 3 的网格状：

.container {    display: grid;    grid-template-columns: repeat(3, 1fr);}

设置容器内子元素的样式，是通过伪元素来设置的：

.container span {    position: relative;}.container span::before,.container span::after {    content: '';    position: absolute;    box-sizing: border-box;    border-style: none solid solid none;    border-width: 1em;    border-color: gold;    width: 100%;    height: 100%;}

旋转容器，让它的尖端朝上：

.container {    transform: rotate(-135deg);}

增加子元素尺寸由小到大变化的动画：

.container span::before,.container span::after {    animation:         animate-scale 1.6s linear infinite;}@keyframes animate-scale {    from {        width: 1%;        height: 1%;    }    to {        width: 100%;        height: 100%;    }}

增加子元素边框色变化的动画：

.container span::before,.container span::after {    animation:         animate-border-color 1.6s linear infinite,        animate-scale 1.6s linear infinite;}@keyframes animate-border-color {    0%, 25% {        border-color: tomato;    }    50%, 75% {        border-color: gold;    }    100% {        border-color: black;    }}

增加子元素边框宽度变化的动画：

.container span::before,.container span::after {    animation:         animate-border-width 1.6s linear infinite,        animate-border-color 1.6s linear infinite,        animate-scale 1.6s linear infinite;}

最后，让 ::after 伪元素的动画时间慢半拍：

.container span::after {    animation-delay: -0.8s;}@keyframes animate-border-width {    0%, 100%{        border-width: 0.1em;    }    25% {        border-width: 1.5em;    }}

大功告成！