如何用純 CSS 創作一盤傳統蚊香
阿新 • • 發佈:2018-11-24
效果預覽
線上演示按下右側的“點選預覽”按鈕可以在當前頁面預覽,點選連結可以全屏預覽。
https://codepen.io/comehope/pen/BVpvMz
可互動視訊教程
此視訊是可以互動的,你可以隨時暫停視訊,編輯視訊中的程式碼。
請用 chrome, safari, edge 開啟觀看。
https://scrimba.com/p/pEgDAM/cZ8Ebf7
原始碼下載
本地下載每日前端實戰系列的全部原始碼請從 github 下載:
https://github.com/comehope/front-end-daily-challenges
程式碼解讀
定義 dom,容器中包含 8 個子元素:
<div class="coil"> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> </div>
居中顯示:
body {
margin: 0;
height: 100vh;
display: flex;
align-items: center;
justify-content: center;
background: radial-gradient(circle at center, midnightblue, black);
}
畫出紋香盤要用的框線:
.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; }
把一半框線放置到上方:
.coil span:nth-child(odd) {
align-self: flex-end;
}
刪除掉上方框線的下邊框,和下方框線的上邊框:
.coil span:nth-child(odd) {
border-bottom: none;
}
.coil span:nth-child(even) {
border-top: none;
}
對齊上下邊框:
.coil span:nth-child(even) {
transform: translateX(-1em);
}
把邊框改為曲線:
.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%;
}
用偽元素畫出蚊香最中間的部分:
.coil::before {
content: '';
position: absolute;
width: 1em;
height: 1em;
background-color: darkgreen;
border-radius: 50%;
left: -1.5em;
top: -0.5em;
}
用偽元素畫出蚊香的燃點:
.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;
}
最後,為燃點增加閃動的效果:
.coil::after {
animation: blink 1s linear infinite alternate;
}
@keyframes blink {
to {
box-shadow: 0 0 0 white;
}
}
大功告成!
原文地址:https://segmentfault.com/a/1190000015246974