基于snowfall的玫瑰花瓣飘落效果

玫瑰花瓣飘落效果

做专题时，常常需要添加一些动效，可以让我们的页面活起来
就像最近某电商网站一系列雪花飘落效果
看了网上封装的snowfall.js配置挺方便的，用起来也蛮好的

用法

1.首先引入jquery
2.再引入snowfall.js

3.开启雪花特效
$(document).snowfall();

4.配置参数
$(document).snowfall({flakeCount : 100, maxSpeed : 10});

常用的可配置参数：

image:"",//图片链接
flakeCount : 20,//数量
flakeColor : '#ffffff',颜色
minSize : 1,最小size
maxSize : 2,最大size
minSpeed : 1,最小速度
maxSpeed : 5,最大速度
round : false,是否圆润
shadow : false,是否阴影

清除雪花
$(‘#element’).snowfall(‘clear’);

如果要飘落几种不同的图片
可以多开启几种雪花特效：

$(document).snowfall({image: "http://source.qunar.com/mobile_platform/mobile_douxing/qtuan/topic/pctopic/20150907-bzwq/f3.png",minSize: 28,maxSize: 70});$(document).snowfall({image: "http://source.qunar.com/mobile_platform/mobile_douxing/qtuan/topic/pctopic/20150907-bzwq/f4.png",minSize: 28,maxSize: 50});

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"><meta content="yes" name="apple-mobile-web-app-capable"><meta content="telephone=no" name="format-detection" /><title>title</title><link rel="stylesheet" type="text/css" href="http://q.qunarzz.com/resetcss/prd/1.0.2/reset.css">
</head>
<body><script src='http://q.qunarzz.com/jquery/prd/jquery-1.7.2.js'></script><script>if (!Date.now)Date.now = function() { return new Date().getTime(); };(function() {'use strict';var vendors = ['webkit', 'moz'];for (var i = 0; i < vendors.length && !window.requestAnimationFrame; ++i) {var vp = vendors[i];window.requestAnimationFrame = window[vp+'RequestAnimationFrame'];window.cancelAnimationFrame = (window[vp+'CancelAnimationFrame']|| window[vp+'CancelRequestAnimationFrame']);}if (/iP(ad|hone|od).*OS 6/.test(window.navigator.userAgent) // iOS6 is buggy|| !window.requestAnimationFrame || !window.cancelAnimationFrame) {var lastTime = 0;window.requestAnimationFrame = function(callback) {var now = Date.now();var nextTime = Math.max(lastTime + 16, now);return setTimeout(function() { callback(lastTime = nextTime); },nextTime - now);};window.cancelAnimationFrame = clearTimeout;}
}());(function($){$.snowfall = function(element, options){var flakes = [],defaults = {flakeCount : 20,flakeColor : '#ffffff',flakePosition: 'absolute',flakeIndex: 999999,minSize : 1,maxSize : 2,minSpeed : 1,maxSpeed : 5,round : false,shadow : false,collection : false,collectionHeight : 40,deviceorientation : false},options = $.extend(defaults, options),random = function random(min, max){return Math.round(min + Math.random()*(max-min));};$(element).data("snowfall", this);// Snow flake objectfunction Flake(_x, _y, _size, _speed){// Flake propertiesthis.x  = _x;this.y  = _y;this.size = _size;this.speed = _speed;this.step = 0;this.stepSize = random(1,10) / 100;if(options.collection){this.target = canvasCollection[random(0,canvasCollection.length-1)];}var flakeMarkup = null;if(options.image){flakeMarkup = document.createElement("img");flakeMarkup.src = options.image;}else{flakeMarkup = document.createElement("div");$(flakeMarkup).css({'background' : options.flakeColor});}$(flakeMarkup).attr({'class': 'snowfall-flakes', }).css({'width' : this.size, 'height' : this.size, 'position' : options.flakePosition, 'top' : this.y, 'left' : this.x, 'fontSize' : 0, 'zIndex' : options.flakeIndex});if($(element).get(0).tagName === $(document).get(0).tagName){$('body').append($(flakeMarkup));element = $('body');}else{$(element).append($(flakeMarkup));}this.element = flakeMarkup;// Update function, used to update the snow flakes, and checks current snowflake against boundsthis.update = function(){this.y += this.speed;if(this.y > (elHeight) - (this.size  + 6)){this.reset();}this.element.style.top = this.y + 'px';this.element.style.left = this.x + 'px';this.step += this.stepSize;if (doRatio === false) {this.x += Math.cos(this.step);} else {this.x += (doRatio + Math.cos(this.step));}// Pileup checkif(options.collection){if(this.x > this.target.x && this.x < this.target.width + this.target.x && this.y > this.target.y && this.y < this.target.height + this.target.y){var ctx = this.target.element.getContext("2d"),curX = this.x - this.target.x,curY = this.y - this.target.y,colData = this.target.colData;if(colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] !== undefined || curY+this.speed+this.size > this.target.height){if(curY+this.speed+this.size > this.target.height){while(curY+this.speed+this.size > this.target.height && this.speed > 0){this.speed *= .5;}ctx.fillStyle = "#fff";if(colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] == undefined){colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] = 1;ctx.fillRect(curX, (curY)+this.speed+this.size, this.size, this.size);}else{colData[parseInt(curX)][parseInt(curY+this.speed)] = 1;ctx.fillRect(curX, curY+this.speed, this.size, this.size);}this.reset();}else{// flow to the sidesthis.speed = 1;this.stepSize = 0;if(parseInt(curX)+1 < this.target.width && colData[parseInt(curX)+1][parseInt(curY)+1] == undefined ){// go leftthis.x++;}else if(parseInt(curX)-1 > 0 && colData[parseInt(curX)-1][parseInt(curY)+1] == undefined ){// go rightthis.x--;}else{//stop
                                            ctx.fillStyle = "#fff";ctx.fillRect(curX, curY, this.size, this.size);colData[parseInt(curX)][parseInt(curY)] = 1;this.reset();}}}}}if(this.x + this.size > (elWidth) - widthOffset || this.x < widthOffset){this.reset();}}// Resets the snowflake once it reaches one of the bounds setthis.reset = function(){this.y = 0;this.x = random(widthOffset, elWidth - widthOffset);this.stepSize = random(1,10) / 100;this.size = random((options.minSize * 100), (options.maxSize * 100)) / 100;this.element.style.width = this.size + 'px';this.element.style.height = this.size + 'px';this.speed = random(options.minSpeed, options.maxSpeed);}}// local varsvar i = 0,elHeight = $(element).height(),elWidth = $(element).width(),widthOffset = 0,snowTimeout = 0;// Collection Piece ******************************if(options.collection !== false){var testElem = document.createElement('canvas');if(!!(testElem.getContext && testElem.getContext('2d'))){var canvasCollection = [],elements = $(options.collection),collectionHeight = options.collectionHeight;for(var i =0; i < elements.length; i++){var bounds = elements[i].getBoundingClientRect(),$canvas = $('<canvas/>',{'class' : 'snowfall-canvas'}),collisionData = [];if(bounds.top-collectionHeight > 0){$('body').append($canvas);$canvas.css({'position' : options.flakePosition,'left'     : bounds.left + 'px','top'      : bounds.top-collectionHeight + 'px'}).prop({width: bounds.width,height: collectionHeight});for(var w = 0; w < bounds.width; w++){collisionData[w] = [];}canvasCollection.push({element : $canvas.get(0), x : bounds.left, y : bounds.top-collectionHeight, width : bounds.width, height: collectionHeight, colData : collisionData});}}}else{// Canvas element isnt supported
                    options.collection = false;}}// ************************************************// This will reduce the horizontal scroll bar from displaying, when the effect is applied to the whole pageif($(element).get(0).tagName === $(document).get(0).tagName){widthOffset = 25;}// Bind the window resize event so we can get the innerHeight again
            $(window).bind("resize", function(){elHeight = $(element)[0].clientHeight;elWidth = $(element)[0].offsetWidth;});// initialize the flakesfor(i = 0; i < options.flakeCount; i+=1){flakes.push(new Flake(random(widthOffset,elWidth - widthOffset), random(0, elHeight), random((options.minSize * 100), (options.maxSize * 100)) / 100, random(options.minSpeed, options.maxSpeed)));}// This adds the style to make the snowflakes round via border radius propertyif(options.round){$('.snowfall-flakes').css({'-moz-border-radius' : options.maxSize, '-webkit-border-radius' : options.maxSize, 'border-radius' : options.maxSize});}// This adds shadows just below the snowflake so they pop a bit on lighter colored web pagesif(options.shadow){$('.snowfall-flakes').css({'-moz-box-shadow' : '1px 1px 1px #555', '-webkit-box-shadow' : '1px 1px 1px #555', 'box-shadow' : '1px 1px 1px #555'});}// On newer Macbooks Snowflakes will fall based on deviceorientationvar doRatio = false;if (options.deviceorientation) {$(window).bind('deviceorientation', function(event) {doRatio = event.originalEvent.gamma * 0.1;});}// this controls flow of the updating snowfunction snow(){for( i = 0; i < flakes.length; i += 1){flakes[i].update();}snowTimeout = requestAnimationFrame(function(){snow()});}snow();// clears the snowflakesthis.clear = function(){$('.snowfall-canvas').remove();$(element).children('.snowfall-flakes').remove();cancelAnimationFrame(snowTimeout);}};// Initialize the options and the plugin
    $.fn.snowfall = function(options){if(typeof(options) == "object" || options == undefined){return this.each(function(i){(new $.snowfall(this, options));});}else if (typeof(options) == "string") {return this.each(function(i){var snow = $(this).data('snowfall');if(snow){snow.clear();}});}};
})(jQuery);function flowerfall(){$(document).snowfall('clear');$(document).snowfall({image: "http://source.qunar.com/mobile_platform/mobile_douxing/qtuan/topic/pctopic/20150907-bzwq/f1.png",minSize: 28,maxSize: 90});$(document).snowfall({image: "http://source.qunar.com/mobile_platform/mobile_douxing/qtuan/topic/pctopic/20150907-bzwq/f2.png",minSize: 28,maxSize: 50});$(document).snowfall({image: "http://source.qunar.com/mobile_platform/mobile_douxing/qtuan/topic/pctopic/20150907-bzwq/f3.png",minSize: 28,maxSize: 70});$(document).snowfall({image: "http://source.qunar.com/mobile_platform/mobile_douxing/qtuan/topic/pctopic/20150907-bzwq/f4.png",minSize: 28,maxSize: 50});$(document).snowfall({image: "http://source.qunar.com/mobile_platform/mobile_douxing/qtuan/topic/pctopic/20150907-bzwq/f5.png",minSize: 28,maxSize: 90});}flowerfall();</script>
</body>
</html>

转载于:https://www.cnblogs.com/alisalixue/p/5147430.html

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基于snowfall的玫瑰花瓣飘落效果

玫瑰花瓣飘落效果

用法

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