web之利用延迟实现复杂动画、animation

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效果图

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html

<div class="container">
    <div class="ball">div>
    <input type="range" min="0" max="1" step="0.01" />
div>

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style

body {
    display: flex;
    justify-content: center;
}

.container {
    margin-top: 30px;
}

.ball {
    --delay: 0s;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #ff0000;
    margin-bottom: 50px;
    animation: move 1s var(--delay) linear forwards paused;
    /* animation-play-state: running; */
    /* animation-play-state: paused; */
}

@keyframes move {
    50% {
        transform: translate(100px) scale(1.5);
    }

    100% {
        transform: translate(200px) scale(1);
    }
}

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JavaScript

// js方式实现(不考虑此方案)
// let inp = document.querySelector('input');
// inp.oninput = function () {
//     console.log(inp.value);
// }

// 方式二(配合css实现)
let inp = document.querySelector('input'),
    ball = document.querySelector('.ball'),
    cal = () => ball.style.setProperty('--delay', `-${inp.value}s`);

inp.oninput = cal;
cal();