jQuery网站下雪效果

          阅读(83)

    jQuery网站下雪效果

     

    这段代码可以让你的页面下起雪来,很美腻哒

    博主我是在暑假写下这篇文章的,算是为冬季做个准备吧

    下面分享下代码,一共有两种样式哦~

    注意,需要加载jquery库哦~

    jQuery网站下雪效果

    <1.使用说明>

    有两种方式调用特效

    这个大家都懂得吧,我还是补充下吧

    1.直接把代码复制到主题的footer.php或header.php文件中

    2.把代码中的<script></script>去除,再将中间代码新建为一个js文件,再在footer.php或header.php文件中引用

    如:<script type=’text/javascript’ src='<?php bloginfo(“template_url”); ?>/js/tx-xiaxue.js’></script>

    <2.样式一>

    <script type="text/javascript">
    (function($){
    $.fn.snow = function(options){
    var $flake = $('<div id="snowbox" />').css({'position': 'absolute','z-index':'9999', 'top': '-50px'}).html('&#10052;'),
    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({
    minSize: 5, /* 定义雪花最小尺寸 */
    maxSize: 50,/* 定义雪花最大尺寸 */
    newOn: 300 /* 定义密集程度,数字越小越密集 */
    });
    });
    </script>

    <3.样式二>

    <script type="text/javascript">
    /* 控制下雪 */
    function snowFall(snow) {
    /* 可配置属性 */
    snow = snow || {};
    this.maxFlake = snow.maxFlake || 200; /* 最多片数 */
    this.flakeSize = snow.flakeSize || 10; /* 雪花形状 */
    this.fallSpeed = snow.fallSpeed || 1; /* 坠落速度 */
    }
    /* 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 += .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(.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();
    </script>


    2016-08-26 19:08:50


    喜欢 0



还没有人抢沙发呢~

加载中……