前端每日实战:48# 视频演示如何用纯 CSS 创作一盘传统蚊香

afeichuanqi 2019-06-27

前端每日实战:48# 视频演示如何用纯 CSS 创作一盘传统蚊香

效果预览

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

可交互视频教程

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

源代码下载

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

代码解读

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!

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