使用Html5实现树叶飘落的效果

百变鹏仔 3个月前 (10-18) #H5教程

文章标签树叶

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(&#39;images/backgroundLeaves.jpg&#39;) no-repeat top left;}#leafContainer {    position: absolute;    width: 100%;    height: 100%;}#message{    position: absolute;    top: 160px;    width: 100%;    height: 300px;    background:transparent url(&#39;images/textBackground.png&#39;) repeat-x center;    color: #5C090A;    font-size: 220%;    font-family: &#39;Georgia&#39;;    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 > p {    position: absolute;    width: 100px;    height: 100px;    -webkit-animation-iteration-count: infinite;    -webkit-animation-direction: normal;    -webkit-animation-timing-function: linear;}#leafContainer > p > 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：

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const NUMBER_OF_LEAVES = 30;function init(){    var container = document.getElementById(&#39;leafContainer&#39;);    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 + &#39;px&#39;;}function durationValue(value){    return value + &#39;s&#39;;}function createALeaf(){    var leafDiv = document.createElement(&#39;div&#39;);    leafDiv.style.top = "-100px";    leafDiv.style.left = pixelValue(randomInteger(0, 500));    leafDiv.style.webkitAnimationName = &#39;fade, drop&#39;;    var fadeAndDropDuration = durationValue(randomFloat(5, 11));    leafDiv.style.webkitAnimationDuration = fadeAndDropDuration + &#39;, &#39; + fadeAndDropDuration;    var leafDelay = durationValue(randomFloat(0, 5));    leafDiv.style.webkitAnimationDelay = leafDelay + &#39;, &#39; + leafDelay;        var image = document.createElement(&#39;img&#39;);    image.src = &#39;images/realLeaf&#39; + randomInteger(1, 5) + &#39;.png&#39;;    var spinAnimationName = (Math.random() < 0.5) ? &#39;clockwiseSpin&#39; : &#39;counterclockwiseSpinAndFlip&#39;;    image.style.webkitAnimationName = spinAnimationName;    var spinDuration = durationValue(randomFloat(4, 8));    image.style.webkitAnimationDuration = spinDuration;    leafDiv.appendChild(image);    return leafDiv;}window.addEventListener(&#39;load&#39;, init, false);

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