在此基础上加个动态下雪背景

问题遇到的现象和发生背景

加个动态下雪背景

用代码块功能插入代码，请勿粘贴截图
 
html>
<html>
<head>
    <meta charset="UTF-8">
    <title>爱你title>
    <style>
        .box {
            margin-top: 1cm;
            text-align: center;
        }
    style>
head>
 
<style>
    * {
        padding: 0;
        margin: 0;
    }
 
    html, body {
        height: 100%;
        padding: 0;
        margin: 0;
        background: #000;
    }
 
    canvas {
        position: absolute;
        width: 100%;
        height: 100%;
    }
 
    .aa {
        position: fixed;
        left: 50%;
        bottom: 10px;
        color: #ccc
    }
    /*3d立方体图片墙*/
    * {
        padding: 0;
        margin: 0;
    }
 
    #container {
        width: 100%;
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        perspective: 500px;
    }
 
    #box {
        width: 150px;
        height: 150px;
        transform-style: preserve-3d;
        transform: translateZ(-75px);
        transition: transform 1s;
        animation: spin 13s linear infinite;
    }
 
    #box div {
        width: 150px;
        height: 150px;
        position: absolute;
    }
 
    img {
        width: 150px;
        height: 150px;
        opacity: 0.9;
    }
    /*立方体的六个面*/
    .front {
        background-color: rgba(0,255,255,0.2);
        transform: translateZ(75px); /*往外移动100像素*/
    }
 
    .back {
        background-color: rgba(0,255,0,0.3);
        transform: translateZ(-75px) rotateY(180deg); /*往里移动100像素，绕Y轴旋转180度*/
    }
 
    .left {
        background-color: rgba(0,0,255,0.3);
        transform: translateX(-75px) rotateY(-90deg); /*往左移动100像素，绕Y轴旋转90度*/
    }
 
    .right {
        background-color: rgba(255,255,0,.3);
        transform: translateX(75px) rotateY(90deg); /*往右移动100像素，绕Y轴旋转90度*/
    }
 
    .top {
        background-color: rgba(255,0,255,.3);
        transform: translateY(-75px) rotateX(90deg); /*向上移动100像素，绕X轴旋转90度*/
    }
 
    .bottom {
        background-color: rgba(255,0,0,0.3);
        transform: translateY(75px) rotateX(-90deg); /*向下移动100像素，绕X轴旋转90度*/
    }
    /*动画*/
    @keyframes spin {
        0% {
            transform: rotateX(0deg);
        }
 
        20% {
            transform: translateZ(-75px) rotateX(-90deg) rotateY(-90deg);
        }
 
        40% {
            transform: rotateX(180deg);
        }
 
        60% {
            transform: rotateX(360deg) rotateY(0deg);
        }
 
        80% {
            transform: rotateX(360deg) rotateY(180deg);
        }
 
        100% {
            transform: rotateX(360deg) rotateY(360deg);
        }
    }
style>
 
<body>
 
    <canvas id="pinkBoard">canvas>
 
    <div id="container">
        <div id="box">
            
            <div class="front"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/1.jpg" />div>
            <div class="back"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/2.jpg" />div>
            <div class="left"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/3.jpg" />div>
            <div class="right"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/4.jpg" />div>
            <div class="top"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/5.jpg" />div>
            <div class="bottom"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/6.png" />div>
        div>
    div>
    <script>
 
        var settings = {
            particles: {
                length: 500,
                duration: 2,
                velocity: 100,
                effect: -0.75,
                size: 30,
            },
        };
 
 
        (function () {
            var b = 0;
            var c = ["ms", "moz", "webkit", "o"];
            for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) {
                window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"];
                window.cancelAnimationFrame = window[c[a] + "CancelAnimationFrame"] || window[c[a] + "CancelRequestAnimationFrame"]
            }
            if (!window.requestAnimationFrame) {
                window.requestAnimationFrame = function (h, e) {
                    var d = new Date().getTime();
                    var f = Math.max(0, 16 - (d - b));
                    var g = window.setTimeout(function () { h(d + f) }, f);
                    b = d + f;
                    return g
                }
            }
            if (!window.cancelAnimationFrame) {
                window.cancelAnimationFrame = function (d) {
                    clearTimeout(d)
                }
            }
        }());
 
        var Point = (function () {
            function Point(x, y) {
                this.x = (typeof x !== 'undefined') ? x : 0;
                this.y = (typeof y !== 'undefined') ? y : 0;
            }
            Point.prototype.clone = function () {
                return new Point(this.x, this.y);
            };
            Point.prototype.length = function (length) {
                if (typeof length == 'undefined')
                    return Math.sqrt(this.x * this.x + this.y * this.y);
                this.normalize();
                this.x *= length;
                this.y *= length;
                return this;
            };
            Point.prototype.normalize = function () {
                var length = this.length();
                this.x /= length;
                this.y /= length;
                return this;
            };
            return Point;
        })();
 
        var Particle = (function () {
            function Particle() {
                this.position = new Point();
                this.velocity = new Point();
                this.acceleration = new Point();
                this.age = 0;
            }
            Particle.prototype.initialize = function (x, y, dx, dy) {
                this.position.x = x;
                this.position.y = y;
                this.velocity.x = dx;
                this.velocity.y = dy;
                this.acceleration.x = dx * settings.particles.effect;
                this.acceleration.y = dy * settings.particles.effect;
                this.age = 0;
            };
            Particle.prototype.update = function (deltaTime) {
                this.position.x += this.velocity.x * deltaTime;
                this.position.y += this.velocity.y * deltaTime;
                this.velocity.x += this.acceleration.x * deltaTime;
                this.velocity.y += this.acceleration.y * deltaTime;
                this.age += deltaTime;
            };
            Particle.prototype.draw = function (context, image) {
                function ease(t) {
                    return (--t) * t * t + 1;
                }
                var size = image.width * ease(this.age / settings.particles.duration);
                context.globalAlpha = 1 - this.age / settings.particles.duration;
                context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);
            };
            return Particle;
        })();
 
        var ParticlePool = (function () {
            var particles,
                firstActive = 0,
                firstFree = 0,
                duration = settings.particles.duration;
 
            function ParticlePool(length) {
                // create and populate particle pool
                particles = new Array(length);
                for (var i = 0; i < particles.length; i++)
                    particles[i] = new Particle();
            }
            ParticlePool.prototype.add = function (x, y, dx, dy) {
                particles[firstFree].initialize(x, y, dx, dy);
 
                // handle circular queue
                firstFree++;
                if (firstFree == particles.length) firstFree = 0;
                if (firstActive == firstFree) firstActive++;
                if (firstActive == particles.length) firstActive = 0;
            };
            ParticlePool.prototype.update = function (deltaTime) {
                var i;
 
                // update active particles
                if (firstActive < firstFree) {
                    for (i = firstActive; i < firstFree; i++)
                        particles[i].update(deltaTime);
                }
                if (firstFree < firstActive) {
                    for (i = firstActive; i < particles.length; i++)
                        particles[i].update(deltaTime);
                    for (i = 0; i < firstFree; i++)
                        particles[i].update(deltaTime);
                }
 
                // remove inactive particles
                while (particles[firstActive].age >= duration && firstActive != firstFree) {
                    firstActive++;
                    if (firstActive == particles.length) firstActive = 0;
                }
 
 
            };
            ParticlePool.prototype.draw = function (context, image) {
                // draw active particles
                if (firstActive < firstFree) {
                    for (i = firstActive; i < firstFree; i++)
                        particles[i].draw(context, image);
                }
                if (firstFree < firstActive) {
                    for (i = firstActive; i < particles.length; i++)
                        particles[i].draw(context, image);
                    for (i = 0; i < firstFree; i++)
                        particles[i].draw(context, image);
                }
            };
            return ParticlePool;
        })();
 
        (function (canvas) {
            var context = canvas.getContext('2d'),
                particles = new ParticlePool(settings.particles.length),
                particleRate = settings.particles.length / settings.particles.duration, // particles/sec
                time;
 
            function pointOnHeart(t) {
                return new Point(
                    160 * Math.pow(Math.sin(t), 3),
                    130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25
                );
            }
 
            var image = (function () {
                var canvas = document.createElement('canvas'),
                    context = canvas.getContext('2d');
                canvas.width = settings.particles.size;
                canvas.height = settings.particles.size;
 
                function to(t) {
                    var point = pointOnHeart(t);
                    point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;
                    point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;
                    return point;
                }
 
                context.beginPath();
                var t = -Math.PI;
                var point = to(t);
                context.moveTo(point.x, point.y);
                while (t < Math.PI) {
                    t += 0.01; // baby steps!
                    point = to(t);
                    context.lineTo(point.x, point.y);
                }
                context.closePath();
                context.fillStyle = '#00FF7F';
                context.fill();
                var image = new Image();
                image.src = canvas.toDataURL();
                return image;
            })();
 
            function render() {
                requestAnimationFrame(render);
                var newTime = new Date().getTime() / 1000,
                    deltaTime = newTime - (time || newTime);
                time = newTime;
 
                context.clearRect(0, 0, canvas.width, canvas.height);
 
                var amount = particleRate * deltaTime;
                for (var i = 0; i < amount; i++) {
                    var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
                    var dir = pos.clone().length(settings.particles.velocity);
                    particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);
                }
 
                particles.update(deltaTime);
                particles.draw(context, image);
            }
 
            function onResize() {
                canvas.width = canvas.clientWidth;
                canvas.height = canvas.clientHeight;
            }
            window.onresize = onResize;
 
            setTimeout(function () {
                onResize();
                render();
            }, 10);
        })(document.getElementById('pinkBoard'));
 
    script>
body>
html>

c33弄下雪效果


<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>爱你</title>
    <style>
        .box {
            margin-top: 1cm;
            text-align: center;
        }
    </style>
</head>

<style>
    * {
        padding: 0;
        margin: 0;
    }

    html, body {
        height: 100%;
        padding: 0;
        margin: 0;
        background: #000;
    }

    canvas {
        position: absolute;
        width: 100%;
        height: 100%;
    }

    .aa {
        position: fixed;
        left: 50%;
        bottom: 10px;
        color: #ccc
    }
    /*3d立方体图片墙*/
    #container {
        width: 100%;
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        perspective: 500px;
    }

    #box {
        width: 150px;
        height: 150px;
        transform-style: preserve-3d;
        transform: translateZ(-75px);
        transition: transform 1s;
        animation: spin 13s linear infinite;
    }

    #box div {
        width: 150px;
        height: 150px;
        position: absolute;
    }

    img {
        width: 150px;
        height: 150px;
        opacity: 0.9;
    }
    /*立方体的六个面*/
    .front {
        background-color: rgba(0,255,255,0.2);
        transform: translateZ(75px); /*往外移动100像素*/
    }

    .back {
        background-color: rgba(0,255,0,0.3);
        transform: translateZ(-75px) rotateY(180deg); /*往里移动100像素，绕Y轴旋转180度*/
    }

    .left {
        background-color: rgba(0,0,255,0.3);
        transform: translateX(-75px) rotateY(-90deg); /*往左移动100像素，绕Y轴旋转90度*/
    }

    .right {
        background-color: rgba(255,255,0,.3);
        transform: translateX(75px) rotateY(90deg); /*往右移动100像素，绕Y轴旋转90度*/
    }

    .top {
        background-color: rgba(255,0,255,.3);
        transform: translateY(-75px) rotateX(90deg); /*向上移动100像素，绕X轴旋转90度*/
    }

    .bottom {
        background-color: rgba(255,0,0,0.3);
        transform: translateY(75px) rotateX(-90deg); /*向下移动100像素，绕X轴旋转90度*/
    }
    /*动画*/
    @keyframes spin {
        0% {
            transform: rotateX(0deg);
        }

        20% {
            transform: translateZ(-75px) rotateX(-90deg) rotateY(-90deg);
        }

        40% {
            transform: rotateX(180deg);
        }

        60% {
            transform: rotateX(360deg) rotateY(0deg);
        }

        80% {
            transform: rotateX(360deg) rotateY(180deg);
        }

        100% {
            transform: rotateX(360deg) rotateY(360deg);
        }
    }
    /*雪花*/
    .snowflake {
        background: #fff;
        border-radius: 50%;
        background-size: 100% 100%;
        position: fixed;
        top: -3vh;
        z-index: 0
    }

    @keyframes fall {
        100% {
            transform: translate3d(0, 100vh, 0);
        }
    }

    /*文案样式控制*/
    .marquee {
        color: #00FF7F;
        font-size: 20px;
        margin-top: 100px;
        line-height: 40px;
        display: block;
        position: absolute;
        top: 100px; /*距离顶部位置改这里*/
    }
</style>

<body>
    <!--文案-->
    <marquee direction="right" behavior="alternate" scrollamount="15" scrolldelay="10" loop="-1" class="marquee">
        文案内容
    </marquee>
    <canvas id="pinkBoard"></canvas>
    <!--图片墙-->
    <div id="container">
        <div id="box">
            <!--图片地址改为对应的本地地址-->
            <div class="front"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/1.jpg" /></div>
            <div class="back"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/2.jpg" /></div>
            <div class="left"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/3.jpg" /></div>
            <div class="right"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/4.jpg" /></div>
            <div class="top"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/5.jpg" /></div>
            <div class="bottom"><img src="https://kysonlai.gitee.io/css3_cubic_wall/imgs/6.png" /></div>
        </div>
    </div>
    <!--雪花效果-->
    <script>
        +function () {
            let arrEl = [], arrCss = [];
            for (var i = 0; i < 300; i++) {//300个雪点，更加多改这里
                let size = Math.ceil(Math.random() * 6);//雪点大小，随机1~6px大小
                let left = Math.random() * 100;
                let time = 5 + Math.random() * 8;
                let delay = Math.random() * 10;
                arrEl.push(`<div class='snowflake'></div>`);
                arrCss.push(`.snowflake:nth-child(${i + 1}) {
width:${size}px;height:${size}px;
                        left: ${left}vw;
                        animation: fall ${time}s linear infinite;
                        animation-delay: -${delay}s;
                      }`);
            }
            document.write('<div>' + arrEl.join('') + '</div><style>' + arrCss.join('') + '</style>')
        }();
    </script>

    <script>

        var settings = {
            particles: {
                length: 500,
                duration: 2,
                velocity: 100,
                effect: -0.75,
                size: 30,
            },
        };


        (function () {
            var b = 0;
            var c = ["ms", "moz", "webkit", "o"];
            for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) {
                window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"];
                window.cancelAnimationFrame = window[c[a] + "CancelAnimationFrame"] || window[c[a] + "CancelRequestAnimationFrame"]
            }
            if (!window.requestAnimationFrame) {
                window.requestAnimationFrame = function (h, e) {
                    var d = new Date().getTime();
                    var f = Math.max(0, 16 - (d - b));
                    var g = window.setTimeout(function () { h(d + f) }, f);
                    b = d + f;
                    return g
                }
            }
            if (!window.cancelAnimationFrame) {
                window.cancelAnimationFrame = function (d) {
                    clearTimeout(d)
                }
            }
        }());

        var Point = (function () {
            function Point(x, y) {
                this.x = (typeof x !== 'undefined') ? x : 0;
                this.y = (typeof y !== 'undefined') ? y : 0;
            }
            Point.prototype.clone = function () {
                return new Point(this.x, this.y);
            };
            Point.prototype.length = function (length) {
                if (typeof length == 'undefined')
                    return Math.sqrt(this.x * this.x + this.y * this.y);
                this.normalize();
                this.x *= length;
                this.y *= length;
                return this;
            };
            Point.prototype.normalize = function () {
                var length = this.length();
                this.x /= length;
                this.y /= length;
                return this;
            };
            return Point;
        })();

        var Particle = (function () {
            function Particle() {
                this.position = new Point();
                this.velocity = new Point();
                this.acceleration = new Point();
                this.age = 0;
            }
            Particle.prototype.initialize = function (x, y, dx, dy) {
                this.position.x = x;
                this.position.y = y;
                this.velocity.x = dx;
                this.velocity.y = dy;
                this.acceleration.x = dx * settings.particles.effect;
                this.acceleration.y = dy * settings.particles.effect;
                this.age = 0;
            };
            Particle.prototype.update = function (deltaTime) {
                this.position.x += this.velocity.x * deltaTime;
                this.position.y += this.velocity.y * deltaTime;
                this.velocity.x += this.acceleration.x * deltaTime;
                this.velocity.y += this.acceleration.y * deltaTime;
                this.age += deltaTime;
            };
            Particle.prototype.draw = function (context, image) {
                function ease(t) {
                    return (--t) * t * t + 1;
                }
                var size = image.width * ease(this.age / settings.particles.duration);
                context.globalAlpha = 1 - this.age / settings.particles.duration;
                context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);
            };
            return Particle;
        })();

        var ParticlePool = (function () {
            var particles,
                firstActive = 0,
                firstFree = 0,
                duration = settings.particles.duration;

            function ParticlePool(length) {
                // create and populate particle pool
                particles = new Array(length);
                for (var i = 0; i < particles.length; i++)
                    particles[i] = new Particle();
            }
            ParticlePool.prototype.add = function (x, y, dx, dy) {
                particles[firstFree].initialize(x, y, dx, dy);

                // handle circular queue
                firstFree++;
                if (firstFree == particles.length) firstFree = 0;
                if (firstActive == firstFree) firstActive++;
                if (firstActive == particles.length) firstActive = 0;
            };
            ParticlePool.prototype.update = function (deltaTime) {
                var i;

                // update active particles
                if (firstActive < firstFree) {
                    for (i = firstActive; i < firstFree; i++)
                        particles[i].update(deltaTime);
                }
                if (firstFree < firstActive) {
                    for (i = firstActive; i < particles.length; i++)
                        particles[i].update(deltaTime);
                    for (i = 0; i < firstFree; i++)
                        particles[i].update(deltaTime);
                }

                // remove inactive particles
                while (particles[firstActive].age >= duration && firstActive != firstFree) {
                    firstActive++;
                    if (firstActive == particles.length) firstActive = 0;
                }


            };
            ParticlePool.prototype.draw = function (context, image) {
                // draw active particles
                if (firstActive < firstFree) {
                    for (i = firstActive; i < firstFree; i++)
                        particles[i].draw(context, image);
                }
                if (firstFree < firstActive) {
                    for (i = firstActive; i < particles.length; i++)
                        particles[i].draw(context, image);
                    for (i = 0; i < firstFree; i++)
                        particles[i].draw(context, image);
                }
            };
            return ParticlePool;
        })();

        (function (canvas) {
            var context = canvas.getContext('2d'),
                particles = new ParticlePool(settings.particles.length),
                particleRate = settings.particles.length / settings.particles.duration, // particles/sec
                time;

            function pointOnHeart(t) {
                return new Point(
                    160 * Math.pow(Math.sin(t), 3),
                    130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25
                );
            }

            var image = (function () {
                var canvas = document.createElement('canvas'),
                    context = canvas.getContext('2d');
                canvas.width = settings.particles.size;
                canvas.height = settings.particles.size;

                function to(t) {
                    var point = pointOnHeart(t);
                    point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;
                    point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;
                    return point;
                }

                context.beginPath();
                var t = -Math.PI;
                var point = to(t);
                context.moveTo(point.x, point.y);
                while (t < Math.PI) {
                    t += 0.01; // baby steps!
                    point = to(t);
                    context.lineTo(point.x, point.y);
                }
                context.closePath();
                context.fillStyle = '#00FF7F';
                context.fill();
                var image = new Image();
                image.src = canvas.toDataURL();
                return image;
            })();

            function render() {
                requestAnimationFrame(render);
                var newTime = new Date().getTime() / 1000,
                    deltaTime = newTime - (time || newTime);
                time = newTime;

                context.clearRect(0, 0, canvas.width, canvas.height);

                var amount = particleRate * deltaTime;
                for (var i = 0; i < amount; i++) {
                    var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
                    var dir = pos.clone().length(settings.particles.velocity);
                    particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);
                }

                particles.update(deltaTime);
                particles.draw(context, image);
            }

            function onResize() {
                canvas.width = canvas.clientWidth;
                canvas.height = canvas.clientHeight;
            }
            window.onresize = onResize;

            setTimeout(function () {
                onResize();
                render();
            }, 10);
        })(document.getElementById('pinkBoard'));

    </script>
</body>
</html>

简单点的就是 加个 背景图片 。难点的用js写下雪效果
https://blog.csdn.net/weixin_52580677/article/details/122505982

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