5

图片描述

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/oybWBy

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/cG64puy

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 5 个子元素:

<div class="equalizer">
    <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;
}

定义均衡器的样式:

.equalizer {
    width: 10em;
    height: 10em;
    display: flex;
    justify-content: space-between;
}

.equalizer span {
    width: 1.5em;
    background: linear-gradient(0deg, green, yellow, red);
}

定义均衡器竖条的动画效果:

.equalizer span {
    animation: up-and-down 2s linear infinite;
}

@keyframes up-and-down{
    0%, 100% {
        clip-path: inset(27% 0 0 0);
    }

    10% {
        clip-path: inset(17% 0 0 0);
    }

    20% {
        clip-path: inset(55% 0 0 0);
    }

    30% {
        clip-path: inset(30% 0 0 0);
    }

    40% {
        clip-path: inset(13% 0 0 0);
    }

    50% {
        clip-path: inset(38% 0 0 0);
    }

    60% {
        clip-path: inset(80% 0 0 0);
    }

    70% {
        clip-path: inset(21% 0 0 0);
    }

    80% {
        clip-path: inset(0% 0 0 0);
    }

    90% {
        clip-path: inset(36% 0 0 0);
    }
}

最后,设置各竖条依次动画:

.equalizer span {
    animation: up-and-down 2s linear infinite calc(-1 * 0.4s * (var(--n) - 1));
}

.equalizer span:nth-child(1) {
    --n: 1;
}

.equalizer span:nth-child(2) {
    --n: 2;
}

.equalizer span:nth-child(3) {
    --n: 3;
}

.equalizer span:nth-child(4) {
    --n: 4;
}

.equalizer span:nth-child(5) {
    --n: 5;
}

大功告成!


comehope
9.4k 声望14.4k 粉丝

💯累计分享170+个项目💯