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 charset="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-animation-timing-function: ease-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 clockwiseSpin{0% { -webkit-transform: rotate(-50deg); }100% {-webkit-transform: rotate(50deg); }}@-webkit-keyframes counterclockwiseSpinAndFlip {0% { -webkit-transform: scale(-1, 1) rotate(50deg); }100% {-webkit-transform: 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){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) ? 'clockwiseSpin' : 'counterclockwiseSpinAndFlip';image.style.webkitAnimationName = spinAnimationName;var spinDuration = durationValue(randomFloat(4, 8));image.style.webkitAnimationDuration = spinDuration;leafDiv.appendChild(image);return leafDiv;}window.addEventListener('load', init, false);
转载地址：/css3-fall-leaves.html
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