实现如图所示的东西效果（落叶下落）：
html代码：
<!doctype html><html><head> <title>html5树叶飘落动画</title> <meta chart="utf-8"> <meta name="viewport" content="width=500px, initial-scale=0.64"> <link rel="stylesheet" href="leaves.css" type="text/css"> <script src="leaves.js" type="text/javascript"></script></head><body> <div id="container"> <div id="leafcontainer"></div> <div id="message"> <em>这是基于webkit的落叶动画</em> </div> </div> </body></html>css代码：body{ background-color: #4e4226;}#container { position: relative; height: 700px; width: 500px; margin: 10px auto; overflow: hidden; border: 4px solid #5c090a; background: #4e4226 url('images/backgroundleaves.jpg') no-repeat top left;}#leafcontainer { position: absolute; width: 100%; height: 100%;}#message{ position: absolute; top: 160px; width: 100%; height: 300px; background:transparent url('images/textbackground.png') repeat-x center; color: #5c090a; font-size: 220%; font-family: 'georgia'; text-align: center; padding: 20px 10px; -webkit-box-sizing: border-box; -webkit-background-size: 100% 100%; z-index: 1;}em { font-weight: bold; font-style: normal;}#leafcontainer > div { position: absolute; width: 100px; height: 100px; -webkit-animation-iteration-count: infinite; -webkit-animation-direction: normal; -webkit-animation-timing-function: linear;}#leafcontainer > div > img { position: absolute; width: 100px; height: 100px; -webkit-animation-iteration-count: infinite; -webkit-animation-direction: alternate; -webkit-描叙animation-timing-function: ea-in-out; -webkit-transform-origin: 50% -100%;}@-webkit-keyframes fade{ 0% { opacity: 1; } 95% { opacity: 1; } 100% { opacity: 0; }}@-webkit-keyframes drop{ 0% { -webkit-transform: translate(0px, -50px); } 100% { -webkit-transform: translate(0px, 650px); }}@-webkit-keyframes clockwispin{ 0% { -webkit-transform: rotate(-50deg); } 100% { -webkit-transform: rotate(50deg); }}@-webkit-keyframes counterclockwispinandflip { 0% { -webkit-transform: scale(-1, 1) rotate(50deg); } 100% { -webkit-transform跨马鞍: scale(-1, 1) rotate(-50deg); }}js代码：const number_of_leaves = 30;function init(){ var container = document.getelementbyid('leafcontainer'); for (var i = 0; i < number_of_leaves; i++) { container.appendchild(createaleaf()); }}function randominteger(low, high){ return low + math.floor(math.random() * (high - low));}function randomfloat(low, high){ return low + math.random() * (high - low);}function pixelvalue(value){ 小学五年级作文辅导return value + 'px';}function durationvalue(value){ return value + 's';}function createaleaf(){ var leafdiv = document.createelement('div'); leafdiv.style.top = "-100px"; leafdiv.style.left = pixelvalue(randominteger(0, 500)); leafdiv.style.webkitanimationname = 'fade, drop'; var fadeanddropduration = durationvalue(randomfloat(5, 11)); leafdiv.style.webkitanimationduration = fadeanddropduration + ', ' + fadeanddropduration; var leafdelay = durationvalue(randomfloat(0, 5)); leafdiv.style.webkitanimationdelay = leafdelay + ', ' + leafdelay; var image = document.createelement('img'); image.src = 'images/realleaf' + randominteger(1, 5) + '.png'; var spinanimationname = (math.random() < 0.5) ? 'clockwispin' : 'counterclockwispinandflip'; image.style.webkitanimationname = spinanimationname; var spinduration = durationvalue(randomfloat(4, 8)); image.style.webkitanimationduration = spinduration; leafdiv.appendchild(image); return leafdiv;}window.addeventlistener('load', init, fal);ps：下面看下html5 canvas处理连续帧图片,下面的代码基于ie8以上
<!doctype html><html><head><meta chart="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, ur-scalable=no"/><title>canvas demo</title><script>var canvas = null;//初始化参数var img = null;var ctx = null;var imageready = fal;window.onload = function() { var canvas = document.getelementbyid("animation_canvas"); canvas.width = canvas.parentnode.clientwidth; canvas.height = canva咏梅古诗s.parentnode.clientheight; if (!canvas.getcontext) { console.log("canvas not supported. plea install a html5 compatible browr."); return; } // get 2d context of canvas and draw rectangel ctx = canvas.getcontext("2d"); ctx.fillstyle="black"; ctx.fillrect(0, 0, canvas.width, canvas.height); console.log(canvas.height); img = document.createelement('img'); img.src = "images/ab0.png"; img.onload = loaded();} //保证只有图像加载后才开始循环动画function loaded() { imageready = true; ttimeout( update, 1000/3);//添加3帧每秒间隔计时器}function redraw() { ctx.fillstyle="black"; ctx.fillrect(0, 0, 460, 460); ctx.drawimage(img, 0, 0, 232, 180);} //为了让图片以规定的速度动画，我们必须追踪已经经过的时间，然后根据分配给每帧的时间播放帧。基本步骤是：//1、按每秒几帧设置动画速度(msperframe)。//2、当你循环游戏时，计算一下自最后一帧以后已经经过了多少时间（delta）。//3、如果已经经过的时间足够把动画帧播完，那么播放这一帧并设置累积delta为0。//4、如果已经经过的时间不够，那么记住（累积）delta时间（acdelta）。var frame = 0;var lastupdahelptetime = 0;var acdelta = 0;var msperframe = 200;function update() { requestanimframe(update); var delta = date.now() - lastupdatetime; //console.log(date.now(),lastupdatetime); if (acdelta > msperframe){ acdelta = 0; redraw(); img.src='images/ab'+frame+'.png'; frame++; if(frame >= 3) frame = 0; //当绘制后且帧推进完，计时器就会重置。 }el{ acdelta += delta; } lastupdatetime = date.now();}//requestanimframe的作用基本上就是ttimeout，但浏览器知道你正在渲染帧，所以它可以优化绘制循环，以及如何与剩下的页面回流。//在某些情况下，ttimeout比requestanimframe更好用，特别是对于手机。//以下是在不同的浏览器上调用requestanimframe的情况也不同，标准的检测方法如下：window.requestanimframe = (function(){ return window.requestanimationframe || window.webkitrequestanimationframe || window.mozrequestanimationframe || window.orequestanimationframe || window.msrequestanimationframe || function( callback ){ window.ttimeout(callback, 1000 / 3); //如果requestanimframe支持不可用，还是可以用回内置的ttimeout。 };})();</script></head><body style="position:absolute;margin:0;padding:0;width:100%;height:100%;"> <canvas id="animation_canvas"></canvas></body></html>总结
以上所述是www.887551.com给大家介绍的基于html5+webkit实现树叶飘落动画，希望对大家有所帮助
本文发布于:2023-04-06 11:14:44，感谢您对本站的认可！
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