先看效果
再看代码：
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>灯光效果</title><link href="https://fonts.googleapis.com/css2?family=Cinzel:wght@700&display=swap" type="text/css" rel="Stylesheets"><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script><style>:root {--glitter: url("https://assets.codepen.io/13471/silver-glitter-background.png");--ratio-x: .5;--ratio-y: .75;--from-center: .5;}main {--bgoffsetx: calc( 2.9px * var(--ratio-x));--bgoffsety: calc( 4.3px * var(--ratio-y));--pointerx: calc( 100% * var(--ratio-x));--pointery: calc( 100% * var(--ratio-y));--h: calc( 360deg * var( --from-center ) );--s: calc( 90% * var( --from-center ) );background: linear-gradient(135deg, hsl(28deg, var(--s), 15%), hsl(198deg, var(--s), 15%)), var(--glitter), var(--glitter), radial-gradient(farthest-corner circle at var(--pointerx) var(--pointery), white 20px, rgba(237, 222, 222, 0.38) 150px, black 65%);background-position: calc( 70% + var(--bgoffsetx) ) calc( 70% + var(--bgoffsety) ), calc( 30% - var(--bgoffsetx) ) calc( 30% - var(--bgoffsety) );background-size: cover, 560px auto, 400px auto, cover;background-blend-mode: overlay, multiply, color, overlay;transition: opacity 4s ease-out;}main.loading {opacity: 0;}main {image-rendering: optimizeQuality;transform: translate3d(0, 0, 0.01px);}main * {pointer-events: none;text-anchor: middle;}main svg {mix-blend-mode: color-dodge;fill: #908190;opacity: calc( 1.5 - var(--from-center) );filter: drop-shadow(0 0 30px black) drop-shadow(0 0 10px black) brightness(1.3);}body {color: black;background: black;font-family: "Cinzel", sans-serif;}html, body, main {box-sizing: border-box;margin: 0;padding: 0;height: 100%;width: 100%;display: grid;place-items: center;grid-row: 1;}img {position: absolute;width: 1px;height: 1px;opacity: 0;}.social-icon {stroke-width: 1.25;stroke: cyan;fill: none;stroke-linecap: round;stroke-linejoin: round;position: absolute;bottom: 10px;right: 10px;width: 24px;height: 24px;z-index: 10;-webkit-animation: iconsLoad 10s ease both 1s;animation: iconsLoad 10s ease both 1s;}.social-icon.twitter {right: 40px;-webkit-animation-delay: 0s;animation-delay: 0s;}@-webkit-keyframes iconsLoad {from {opacity: 0;}to {opacity: 1;}}@keyframes iconsLoad {from {opacity: 0;}to {opacity: 1;}}</style>
</head>
<body>
<main id=app class=loading><svg viewBox="-50 0 100 20"><text x="0" y="15">Illuminate</text></svg>
</main>
<img src="https://assets.codepen.io/13471/silver-glitter-background.png" loading=lazy><a class="social-icon github" href="https://blog.csdn.net/qq_35241329?type=blog"><svg viewBox="0 0 24 24"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M9 19c-4.3 1.4 -4.3 -2.5 -6 -3m12 5v-3.5c0 -1 .1 -1.4 -.5 -2c2.8 -.3 5.5 -1.4 5.5 -6a4.6 4.6 0 0 0 -1.3 -3.2a4.2 4.2 0 0 0 -.1 -3.2s-1.1 -.3 -3.5 1.3a12.3 12.3 0 0 0 -6.2 0c-2.4 -1.6 -3.5 -1.3 -3.5 -1.3a4.2 4.2 0 0 0 -.1 3.2a4.6 4.6 0 0 0 -1.3 3.2c0 4.6 2.7 5.7 5.5 6c-.6 .6 -.6 1.2 -.5 2v3.5"></path></svg>
</a>
</body>
<script>// 👆鼠标移动跟随代码$("main").on("pointermove", (e) => {interacted = true;const { x, y } = e.originalEvent;const BOX = e.target.getBoundingClientRect();const POINT = { x: x - BOX.x, y: y - BOX.y };const RATIO = { x: POINT.x / BOX.width, y: POINT.y / BOX.height };const CENTER = fromCenter( RATIO );// 设置css中引用的一些css变量e.target.style.setProperty( "--ratio-x", RATIO.x );e.target.style.setProperty( "--ratio-y", RATIO.y );e.target.style.setProperty( "--from-center", CENTER );});// 数字 🤷♀️function fromCenter({ x, y }) {return Math.min(Math.max( 0, Math.sqrt( (y - .5) * (y - .5) + (x - .5) * (x - .5) ) / .5 ), 1 );}let interacted = false;$("img").on("load", () => {// ⏰ 惰性负载触发不透明度$("main").removeClass("loading");// ✨ 小介绍演示动画$({foo:0}).animate({foo:(Math.PI*3)}, {duration: 8000,easing: "swing",step: function(val) {if ( !interacted ) {document.querySelector("#app").style.setProperty("--ratio-x", (Math.cos(val) + 1.5) / 3);document.querySelector("#app").style.setProperty("--ratio-y", (Math.sin(val) + 2) / 4);}}});});
</script>
</html>
