afeichuanqi 2019-06-27
按下右侧的“点击预览”按钮可以在当前页面预览,点击链接可以全屏预览。
https://codepen.io/comehope/pen/BVpvMz
此视频是可以交互的,你可以随时暂停视频,编辑视频中的代码。
请用 chrome, safari, edge 打开观看。
https://scrimba.com/p/pEgDAM/cZ8Ebf7
每日前端实战系列的全部源代码请从 github 下载:
https://github.com/comehope/front-end-daily-challenges
定义 dom,容器中包含 8 个子元素:
<div class="coil"> <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: radial-gradient(circle at center, midnightblue, black); }
画出纹香盘要用的框线:
.coil { position: relative; display: flex; justify-content: center; } .coil span { position: absolute; width: calc((var(--n) * 2 - 1) * 1em); height: calc((var(--n) - 0.5) * 1em); border: 1em solid darkgreen; } .coil span:nth-child(1) { --n: 1; } .coil span:nth-child(2) { --n: 2; } .coil span:nth-child(3) { --n: 3; } .coil span:nth-child(4) { --n: 4; } .coil span:nth-child(5) { --n: 5; } .coil span:nth-child(6) { --n: 6; } .coil span:nth-child(7) { --n: 7; } .coil span:nth-child(8) { --n: 8; }
把一半框线放置到上方:
.coil span:nth-child(odd) { align-self: flex-end; }
删除掉上方框线的下边框,和下方框线的上边框:
.coil span:nth-child(odd) { border-bottom: none; } .coil span:nth-child(even) { border-top: none; }
对齐上下边框:
.coil span:nth-child(even) { transform: translateX(-1em); }
把边框改为曲线:
.coil span:nth-child(odd) { border-radius: 50% 50% 0 0 / 100% 100% 0 0; } .coil span:nth-child(even) { border-radius: 0 0 50% 50% / 0 0 100% 100%; }
用伪元素画出蚊香最中间的部分:
.coil::before { content: ''; position: absolute; width: 1em; height: 1em; background-color: darkgreen; border-radius: 50%; left: -1.5em; top: -0.5em; }
用伪元素画出蚊香的燃点:
.coil::after { content: ''; position: absolute; width: 1em; height: 1em; border-radius: 50%; top: -0.5em; background-color: darkred; left: -9.5em; z-index: -1; transform: scale(0.9); box-shadow: 0 0 1em white; }
最后,为燃点增加闪动的效果:
.coil::after { animation: blink 1s linear infinite alternate; } @keyframes blink { to { box-shadow: 0 0 0 white; } }
大功告成!