(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: durationjQuery.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);