【wordpress】网站雪花效果

https://ihuan.me/2172.html

使用方法

方法①、复制其中一种JS代码，粘贴到网站</body>标签之前即可；
方法②、去掉代码前后的<script >标签，然后将代码保存为js文件，最后在网站引用即可。
Ps：若没效果，请确认网页是否已载入JQurey，如果没有请在下雪代码之前引入JQ即可。

有小工具的话，可以插入自定义html代码  。 <script>  你的代码 </script>

代码

代码1

(function ($) {
    $.fn.snow = function (options) {
        var $flake = $('<div id="snowbox" />').css({ position: "absolute", "z-index": "9999", top: "-50px" }).html("❄"),
            documentHeight = $(document).height(),
            documentWidth = $(document).width(),
            defaults = { minSize: 10, maxSize: 20, newOn: 1000, flakeColor: "#AFDAEF" /* 此处可以定义雪花颜色，若要白色可以改为#FFFFFF */ },
            options = $.extend({}, defaults, options);
        var interval = setInterval(function () {
            var startPositionLeft = Math.random() * documentWidth - 100,
                startOpacity = 0.5 + Math.random(),
                sizeFlake = options.minSize + Math.random() * options.maxSize,
                endPositionTop = documentHeight - 200,
                endPositionLeft = startPositionLeft - 500 + Math.random() * 500,
                durationFall = documentHeight * 10 + Math.random() * 5000;
            $flake
                .clone()
                .appendTo("body")
                .css({ left: startPositionLeft, opacity: startOpacity, "font-size": sizeFlake, color: options.flakeColor })
                .animate({ top: endPositionTop, left: endPositionLeft, opacity: 0.2 }, durationFall, "linear", function () {
                    $(this).remove();
                });
        }, options.newOn);
    };
})(jQuery);
$(function () {
    $.fn.snow({ 
        /* 定义雪花最小尺寸 */ 
        minSize: 5, 
        /* 定义雪花最大尺寸 */ 
        maxSize: 50, 
        /* 定义密集程度，数字越小越密集 */
        newOn: 300  });
});

代码2

function snowFall(snow) {
    /* 可配置属性 */
    snow = snow || {};
    /* 最多片数 */
    this.maxFlake = snow.maxFlake || 200;
    /* 雪花形状 */
    this.flakeSize = snow.flakeSize || 10;
    /* 坠落速度 */
    this.fallSpeed = snow.fallSpeed || 1;
}
/* 兼容写法*/
requestAnimationFrame =
    window.requestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    window.oRequestAnimationFrame ||
    function (callback) {
        setTimeout(callback, 1000 / 60);
    };
cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame || window.webkitCancelAnimationFrame || window.msCancelAnimationFrame || window.oCancelAnimationFrame;
/* 开始下雪 */
snowFall.prototype.start = function () {
    /* 创建画布 */
    snowCanvas.apply(this);
    /* 创建雪花形状 */
    createFlakes.apply(this);
    /* 画雪 */
    drawSnow.apply(this);
};
/* 创建画布 */
function snowCanvas() {
    /* 添加Dom结点 */
    var snowcanvas = document.createElement("canvas");
    snowcanvas.id = "snowfall";
    snowcanvas.width = window.innerWidth;
    snowcanvas.height = document.body.clientHeight;
    snowcanvas.setAttribute("style", "position:absolute; top: 0; left: 0; z-index: 1; pointer-events: none;");
    document.getElementsByTagName("body")[0].appendChild(snowcanvas);
    this.canvas = snowcanvas;
    this.ctx = snowcanvas.getContext("2d");
    /* 窗口大小改变的处理 */
    window.onresize = function () {
        snowcanvas.width = window.innerWidth;
        / snowcanvas.height = window.innerHeight /;
    };
} 
/* 雪运动对象 */
function flakeMove(canvasWidth, canvasHeight, flakeSize, fallSpeed) {
    this.x = Math.floor(Math.random() * canvasWidth); /* x坐标 */
    this.y = Math.floor(Math.random() * canvasHeight); /* y坐标 */
    this.size = Math.random() * flakeSize + 2; /* 形状 */
    this.maxSize = flakeSize; /* 最大形状 */
    this.speed = Math.random() * 1 + fallSpeed; /* 坠落速度 */
    this.fallSpeed = fallSpeed; /* 坠落速度 */
    this.velY = this.speed; /* Y方向速度 */
    this.velX = 0; /* X方向速度 */
    this.stepSize = Math.random() / 30; /* 步长 */
    this.step = 0; /* 步数 */
}

flakeMove.prototype.update = function () {
    var x = this.x,
        y = this.y;
    /* 左右摆动(余弦) */ this.velX = 0.98;
    if (this.velY <= this.speed) {
        this.velY = this.speed;
    }
    this.velX += Math.cos((this.step += 0.05)) * this.stepSize;
    this.y += this.velY;
    this.x += this.velX;
    /* 飞出边界的处理 */ if (this.x >= canvas.width || this.x <= 0 || this.y >= canvas.height || this.y <= 0) {
        this.reset(canvas.width, canvas.height);
    }
};
/* 飞出边界-放置最顶端继续坠落 */ flakeMove.prototype.reset = function (width, height) {
    this.x = Math.floor(Math.random() * width);
    this.y = 0;
    this.size = Math.random() * this.maxSize + 2;
    this.speed = Math.random() * 1 + this.fallSpeed;
    this.velY = this.speed;
    this.velX = 0;
};
/* 渲染雪花-随机形状（此处可修改雪花颜色！！！） */
flakeMove.prototype.render = function (ctx) {
    var snowFlake = ctx.createRadialGradient(this.x, this.y, 0, this.x, this.y, this.size);
    snowFlake.addColorStop(0, "rgba(255, 255, 255, 0.9)");
    /* 此处是雪花颜色，默认是白色 */
    snowFlake.addColorStop(0.5, "rgba(255, 255, 255, 0.5)");
    /* 若要改为其他颜色，请自行查 */
    snowFlake.addColorStop(1, "rgba(255, 255, 255, 0)");
    /* 找16进制的RGB 颜色代码。 */
    ctx.save();
    ctx.fillStyle = snowFlake;
    ctx.beginPath();
    ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
    ctx.fill();
    ctx.restore();
};
/* 创建雪花-定义形状 */
function createFlakes() {
    var maxFlake = this.maxFlake,
        flakes = (this.flakes = []),
        canvas = this.canvas;
    for (var i = 0; i < maxFlake; i++) {
        flakes.push(new flakeMove(canvas.width, canvas.height, this.flakeSize, this.fallSpeed));
    }
}
/* 画雪 */
function drawSnow() {
    var maxFlake = this.maxFlake,
        flakes = this.flakes;
    (ctx = this.ctx), (canvas = this.canvas), (that = this);
    /* 清空雪花 */
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    for (var e = 0; e < maxFlake; e++) {
        flakes[e].update();
        flakes[e].render(ctx);
    }
    /* 一帧一帧的画 */
    this.loop = requestAnimationFrame(function () {
        drawSnow.apply(that);
    });
}
/* 调用及控制方法 */
var snow = new snowFall({ maxFlake: 60 });
snow.start();