实现如图所示的东西效果（落叶下落）：

html代码：

HTML5树叶飘落动画这是基于webkit的落叶动画

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);

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