juejinBlogsCodes/docs/cssTransition/css/transition/snow.html at master · xiangwenhu/juejinBlogsCodes · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Snow</title>
    <style>
        body {
            background-color: black;
            overflow: hidden;
            height: 100vh;
            cursor: pointer;
        }

        .ts {
            transition-property: all;
            transition-timing-function: ease;
        }


        img {
            height: 15px;
            position: absolute;
            top: 0;
            left: 50vw;
            transform: translate(-50%);
        }
    </style>
</head>

<body>
</body>
<script>

    var animating = false;
    var created = false;
    function createSnows() {
        if (created) {
            return
        }
        for (var i = 0; i < 800; i++) {
            var img = document.createElement("img");
            img.src = "./snow.png";
            img.className = "ts";

            var w = (10 + Math.round(Math.random() * 30)) + "px";
            img.style.width = w;
            img.style.height = w;
            document.body.appendChild(img)
        }
        created = true;
    }

    function updateSnows() {
        [...document.images].forEach(function (el, i) {
            el.classList.add("ts");
            el.style.transitionDuration = 3000 + Math.floor(Math.random() * i * 1000/800 ) + "ms";
            el.style.left = 50 + (Math.random() > 0.49 ? 1 : -1) * Math.random() * 200 + "vw";
            el.style.top = 100 + 1 * Math.round(Math.random() * 50) + "vh";
            el.style.transitionTimingFunction = `cubic-bezier(${Math.random().toFixed(2)},${Math.random().toFixed(2)},${Math.random().toFixed(2)},${Math.random().toFixed(2)})`
        })
    }

    function resetSnows() {
        [...document.images].forEach(function (el, i) {
            el.style.transition = "";
            el.style.top = "0";
            el.style.left = "50vw";
            el.classList.remove("ts");
        })
    }

    createSnows();

    document.body.addEventListener("click", function () {
        resetSnows();
        window.getComputedStyle(document.body);
        requestAnimationFrame(updateSnows)
    })


</script>

</html>