css变量与js联动
css变量与js联动
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
.box {
width: 300px;
height: 300px;
position: absolute;
left: calc(50% - 150px);
top: calc(50% - 150px);
}
.item {
width: 8px;
height: 25px;
background-color: #000;
border-radius: 8px;
position: absolute;
left: calc(50% - 4px);
transform-origin: 0 150px;
transform: rotateZ(calc(var(--index) * var(--base-deg)));
animation: animate var(--time) linear infinite;
/* 利用延迟实现动画交替完成 */
animation-delay: calc(var(--index) * 0.05s - var(--time) / 2);
}
@keyframes animate {
0%,
50% {
background: #050c09;
box-shadow: none;
}
51%,
100% {
background: #38d2dd;
box-shadow: 0 0 5px #38d2dd, 0 0 15px #38d2dd, 0 0 30px #38d2dd,
0 0 60px #38d2dd, 0 0 90px #38d2dd;
}
}
</style>
</head>
<body>
<div class="box">
<div class="item"></div>
</div>
<script>
const ITEM_NUM = 30;
const baseDeg = 360 / ITEM_NUM;
const box = document.querySelector(".box");
box.style.setProperty("--time", `${ITEM_NUM * 0.1}s`);
box.style.setProperty("--base-deg", `${baseDeg}deg`);
for (let i = 0; i < ITEM_NUM; i++) {
const div = document.createElement("div");
div.classList.add("item");
div.style.setProperty("--index", i);
box.appendChild(div);
}
</script>
</body>
</html>
如上代码，可通过js动态生成变量与css的变量与函数进行配合达到意想不到的效果
css变量与js联动
http://localhost:8090/archives/cssbian-liang-yu-jslian-dong