又到了年底，从圣诞节开始，可以发现各大网站的活动是越来越多，都变的银装素裹，本人由于业务需求也需要做这么一个效果，所以就通过google大神找了一下相关资源，结果就出现了N种雪花效果的方式。种类繁多，最后找到了本文看到的这种效果，原作者写的可以说已经满足了我的需求，但是为了符合更多的场景，又再原作者的基础上做了调整。
声明：本文核心代码归原作者@Ivan Lazarevic（https://github.com/kopipejst）所有，本人只增加了一些参数和效果
兼容性：除IE外各主流浏览器（当然也可以调整代码，支持IE高版本浏览器，本文实例不支持IE）
经过调整的代码如下：
（上半部分为jquery-easing，下半部分为雪花效果）
| 代码如下 | 复制代码 |
| (function($){ /* * jQuery Easing v1.3 - http://gsgd.co.uk/sandbox/jquery/easing/ * * Uses the built in easing capabilities added In jQuery 1.1 * to offer multiple easing options * * TERMS OF USE - jQuery Easing * * Open source under the BSD License. * * Copyright 2008 George McGinley Smith * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this list of * conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list * of conditions and the following disclaimer in the documentation and/or other materials * provided with the distribution. * * Neither the name of the author nor the names of contributors may be used to endorse * or promote products derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * */ // t: current time, b: begInnIng value, c: change In value, d: duration jQuery.easing['jswing'] = jQuery.easing['swing']; jQuery.extend( jQuery.easing, { def: 'easeOutQuad', swing: function (x, t, b, c, d) { //alert(jQuery.easing.default); return jQuery.easing[jQuery.easing.def](x, t, b, c, d); }, easeInQuad: function (x, t, b, c, d) { return c*(t/=d)*t + b; }, easeOutQuad: function (x, t, b, c, d) { return -c *(t/=d)*(t-2) + b; }, easeInOutQuad: function (x, t, b, c, d) { if ((t/=d/2) < 1) return c/2*t*t + b; return -c/2 * ((--t)*(t-2) - 1) + b; }, easeInCubic: function (x, t, b, c, d) { return c*(t/=d)*t*t + b; }, easeOutCubic: function (x, t, b, c, d) { return c*((t=t/d-1)*t*t + 1) + b; }, easeInOutCubic: function (x, t, b, c, d) { if ((t/=d/2) < 1) return c/2*t*t*t + b; return c/2*((t-=2)*t*t + 2) + b; }, easeInQuart: function (x, t, b, c, d) { return c*(t/=d)*t*t*t + b; }, easeOutQuart: function (x, t, b, c, d) { return -c * ((t=t/d-1)*t*t*t - 1) + b; }, easeInOutQuart: function (x, t, b, c, d) { if ((t/=d/2) < 1) return c/2*t*t*t*t + b; return -c/2 * ((t-=2)*t*t*t - 2) + b; }, easeInQuint: function (x, t, b, c, d) { return c*(t/=d)*t*t*t*t + b; }, easeOutQuint: function (x, t, b, c, d) { return c*((t=t/d-1)*t*t*t*t + 1) + b; }, easeInOutQuint: function (x, t, b, c, d) { if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b; return c/2*((t-=2)*t*t*t*t + 2) + b; }, easeInSine: function (x, t, b, c, d) { return -c * Math.cos(t/d * (Math.PI/2)) + c + b; }, easeOutSine: function (x, t, b, c, d) { return c * Math.sin(t/d * (Math.PI/2)) + b; }, easeInOutSine: function (x, t, b, c, d) { return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b; }, easeInExpo: function (x, t, b, c, d) { return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b; }, easeOutExpo: function (x, t, b, c, d) { return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b; }, easeInOutExpo: function (x, t, b, c, d) { if (t==0) return b; if (t==d) return b+c; if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b; return c/2 * (-Math.pow(2, -10 * --t) + 2) + b; }, easeInCirc: function (x, t, b, c, d) { return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b; }, easeOutCirc: function (x, t, b, c, d) { return c * Math.sqrt(1 - (t=t/d-1)*t) + b; }, easeInOutCirc: function (x, t, b, c, d) { if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b; return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b; }, easeInElastic: function (x, t, b, c, d) { var s=1.70158;var p=0;var a=c; if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3; if (a < Math.abs(c)) { a=c; var s=p/4; } else var s = p/(2*Math.PI) * Math.asin (c/a); return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b; }, easeOutElastic: function (x, t, b, c, d) { var s=1.70158;var p=0;var a=c; if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3; if (a < Math.abs(c)) { a=c; var s=p/4; } else var s = p/(2*Math.PI) * Math.asin (c/a); return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b; }, easeInOutElastic: function (x, t, b, c, d) { var s=1.70158;var p=0;var a=c; if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5); if (a < Math.abs(c)) { a=c; var s=p/4; } else var s = p/(2*Math.PI) * Math.asin (c/a); if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b; return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b; }, easeInBack: function (x, t, b, c, d, s) { if (s == undefined) s = 1.70158; return c*(t/=d)*t*((s+1)*t - s) + b; }, easeOutBack: function (x, t, b, c, d, s) { if (s == undefined) s = 1.70158; return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b; }, easeInOutBack: function (x, t, b, c, d, s) { if (s == undefined) s = 1.70158; if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b; return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b; }, easeInBounce: function (x, t, b, c, d) { return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b; }, easeOutBounce: function (x, t, b, c, d) { if ((t/=d) < (1/2.75)) { return c*(7.5625*t*t) + b; } else if (t < (2/2.75)) { return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b; } else if (t < (2.5/2.75)) { return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b; } else { return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b; } }, easeInOutBounce: function (x, t, b, c, d) { if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b; return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b; } }); /* * * TERMS OF USE - EASING EQUATIONS * * Open source under the BSD License. * * Copyright 2001 Robert Penner * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this list of * conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list * of conditions and the following disclaimer in the documentation and/or other materials * provided with the distribution. * * Neither the name of the author nor the names of contributors may be used to endorse * or promote products derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * */ $.fn.snow = function(options){ //处理浏览器 var na = window.navigator; var ua = na.userAgent.toLowerCase(); var browserTester = /(webkit|gecko|presto|opera|safari|firefox|chrome|applewebkit)[ /os]*([d_.]+)/ig if(!browserTester.test(ua)) { return; } var winHeight = $(window).height(); var docHeight = $(document).height(); var docWidth = $(document).width(); var defaults = { minSize: 20, //雪花的最小尺寸 maxSize: 50, //雪花的最大尺寸 speed: docHeight * 10, //雪花掉落速度 frequency: 500, //雪花出现的频率 color: "#FFFFFF", //雪花颜色 easing: 'linear', //雪花动画效果 position: 'absolute' //定位方式 }; var options = $.extend({}, defaults, options); var $snow = $('<div>').css({'position': options.position, 'top': '-50px', 'z-index':9999999999}).html(''); var height = options.position == "fixed" ? winHeight : docHeight; var width = docWidth; $('body').css('overflow-x', 'hidden'); var interval = setInterval( function(){ var startPositionLeft = Math.random() * width - 100; var startOpacity = 0.5 + Math.random(); var size = options.minSize + Math.random() * options.maxSize; var endPositionTop = height - 40; var endPositionLeft = startPositionLeft + (Math.random()*10 > 5 ? -500 : 500); $snow.clone().appendTo('body').css({ left: startPositionLeft, opacity: startOpacity, 'font-size': size, color: options.color }).animate({ top: endPositionTop, left: endPositionLeft, opacity: 0.2 },options.speed, options.easing,function(){ $(this).remove() } ); }, options.frequency); }; })(jQuery); |
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调整点有：
增加speed参数，指的是每个雪花的生命周期时长
增加frequency参数，指的是每个雪花之间的间隔时长
增加easing参数，支持jquery-easing插件的所有动画，定义每个雪花的动画
增加position参数，支持雪花随屏幕下落
时间： 2024-09-26 23:36:06