css3落叶特效
2017-03-15 17:05 大写的Z 阅读(1656) 评论(0) 编辑 收藏 举报<!DOCTYPE HTML>
<html>
<head>
<title>落叶特效</title>
<meta charset="utf-8">
<style>
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%; }
#leafContainer > div {
position: absolute; width: 100px; height: 100px;
-webkit-animation-iteration-count: infinite, infinite;
-webkit-animation-direction: normal, normal;
-webkit-animation-timing-function: linear, ease-in;
}
#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); }
}
</style>
</head>
<body>
<div id="container">
<div id="leafContainer"></div>
</div>
<script>
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');
var image = document.createElement('img');
image.src = 'images/realLeaf' + randomInteger(1, 5) + '.png';
leafDiv.style.top = "-100px";
leafDiv.style.left = pixelValue(randomInteger(0, 500));
var spinAnimationName = (Math.random() < 0.5) ? 'clockwiseSpin' : 'counterclockwiseSpinAndFlip';
leafDiv.style.webkitAnimationName = 'fade, drop';
image.style.webkitAnimationName = spinAnimationName;
var fadeAndDropDuration = durationValue(randomFloat(5, 11));
var spinDuration = durationValue(randomFloat(4, 8));
leafDiv.style.webkitAnimationDuration = fadeAndDropDuration + ', ' + fadeAndDropDuration;
var leafDelay = durationValue(randomFloat(0, 5));
leafDiv.style.webkitAnimationDelay = leafDelay + ', ' + leafDelay;
image.style.webkitAnimationDuration = spinDuration;
leafDiv.appendChild(image);
return leafDiv;
}
window.addEventListener('load', init, false);
</script>
</body>
</html>
