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