/*样式一*/
(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 */
    });
});

/*样式二*/
/* 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();