css3流星雨动画
2018-06-29 本文已影响0人
LI_4058
下面是页面源码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
html,body{
width: 100%;height: 100%;margin: 0;overflow: hidden;background: linear-gradient(rgba(0,0,0,.8),rgba(0,0,0,.4));
}
#stars{
margin: 0 auto;max-width: 1600px;position: fixed;top: 0;left: 0;right: 0;bottom: 0;z-index: 2;
}
.star{
display: block;width: 1px;background: transparent;position: relative;opacity: 0;
/*过渡动画*/
animation: star-fall 3s linear infinite;
-webkit-animation: star-fall 3s linear infinite;
-moz-animation: star-fall 3s linear infinite;
}
.star:after {
content: '';
display: block;
border: 0px solid #fff;
border-width: 0px 90px 2px 90px;
border-color: transparent transparent transparent rgba(255, 255, 255, .5);
box-shadow: 0 0 1px 0 rgba(255, 255, 255, .1);
/*变形*/
transform: rotate(-45deg) translate3d(1px, 3px, 0);
-webkit-transform: rotate(-45deg) translate3d(1px, 3px, 0);
-moz-transform: rotate(-45deg) translate3d(1px, 3px, 0);
transform-origin: 0% 100%;
-webkit-transform-origin: 0% 100%;
-moz-transform-origin: 0% 100%;
}
@keyframes star-fall {
0% {
opacity: 0;
transform: scale(0.5) translate3d(0, 0, 0);
-webkit-transform: scale(0.5) translate3d(0, 0, 0);
-moz-transform: scale(0.5) translate3d(0, 0, 0);
}
50% {
opacity: 1;
transform: translate3d(-200px, 200px, 0);
-webkit-transform: translate3d(-200px, 200px, 0);
-moz-transform: translate3d(-200px, 200px, 0);
}
100% {
opacity: 0;
transform: scale(1.2) translate3d(-300px, 300px, 0);
-webkit-transform: scale(1.2) translate3d(-300px, 300px, 0);
-moz-transform: scale(1.2) translate3d(-300px, 300px, 0);
}
}
</style>
</head>
<body>
<div id="stars">
<div class="star" style="top: 0px;left: 500px"></div>
</div>
<script>
var stars = document.getElementById('stars')
// js随机生成流星
for (var j=0;j<30;j++) {
var newStar = document.createElement("div")
newStar.className = "star"
newStar.style.top = randomDistance(500, -100) + 'px'
newStar.style.left = randomDistance(1300, 300) + 'px'
stars.appendChild(newStar)
}
// 封装随机数方法
function randomDistance (max, min) {
var distance = Math.floor(Math.random() * (max - min + 1) + min)
return distance
}
var star = document.getElementsByClassName('star')
// 给流星添加动画延时
for (var i = 0, len = star.length; i < len; i++)
{
star[i].style.animationDelay = i % 6 == 0 ? '0s' : i * 0.8 + 's'
}
</script>
</body>
</html>
