1. 绘制标签
<div class="container">
<span></span>
</div>
2. 设置div背景
在百度上搜索一幅星空的图片
<style>
* {
/* 初始化 */
margin: 0;
padding: 0;
}
body {
/* 高度100% */
height: 100vh;
/* 溢出隐藏 */
overflow: hidden;
}
.container {
background: url(xk1.jpg) no-repeat;
width: 100%;
height: 100%;
position: absolute;
/* 把背景图像扩展到足够大,使背景图像覆盖背景区域 */
background-size: cover;
/* 背景图像设置为正中间 */
background-position: center;
}
</style>
3. 绘制流星和尾巴
span {
width: 10px;
height: 10px;
background-color: #fff;
position: absolute;
left: 50%;
top: 50%;
/* 圆角 */
border-radius: 50%;
/* 发光效果
0 x轴方向的长度
0 y轴方向的长度
10 阴影模糊度,只能为正数
4 阴影的扩散半径
*/
box-shadow: 0px 0 10px 4px rgba(255, 255, 255, 1);
}
span::before {
content: "";
width: 300px;
height: 3px;
/* 渐变背景 90度,由#fff 向完全透明渐变 */
background: linear-gradient(90deg, #fff, transparent);
position: absolute;
top: 50%;
}
4. 添加背景缩放的动画
/* 定义动画 ,背景缩放*/
@keyframes animateBg {
0%,
100% {
transform: scale(1);
}
50% {
transform: scale(1.2);
}
}
添加动画到 .container 的样式中
5. 流星动画
@keyframes animateLx {
0% {
/* 角度旋转315度,x方向移动0px */
transform: rotate(315deg) translateX(0);
opacity: 1;
}
90% {
opacity: 1;
}
100% {
/* 角度旋转315度,x方向移动-1000px 向左边移动 */
transform: rotate(315deg) translateX(-1000px);
opacity: 0;
}
}
添加动画到span标签上
6. 为第一个span单独设置动画出现的位置,和动画效果
span:nth-child(1) {
top: 0px;
left: initial;
right: 0px;
/* 动画延迟时间 */
animation-delay: 0s;
/* 动画时长 */
animation-duration: 1s;
}
7. 为第二个span单独设置动画出现的位置,和动画效果
span:nth-child(2) {
top: 0px;
right: 80px;
left: initial;
animation-delay: 0.1s;
animation-duration: 3s;
}
8. 后续
每添加一个标记,就添加一个对应的样式,通过改变top ,right ,动画延时,动画时长等参数,生成不同的流星
9. 完整代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>流星雨划过天际的动画</title>
<style>
* {
/* 初始化 */
margin: 0;
padding: 0;
}
body {
/* 高度100% */
height: 100vh;
/* 溢出隐藏 */
overflow: hidden;
}
.container {
background: url(xk1.jpg) no-repeat;
width: 100%;
height: 100%;
position: absolute;
/* 把背景图像扩展到足够大,使背景图像覆盖背景区域 */
background-size: cover;
/* 背景图像设置为正中间 */
background-position: center;
/* 执行动画,时长,线性的,无限次数播放 */
animation: animateBg 5s linear infinite;
}
span {
width: 10px;
height: 10px;
background-color: #fff;
position: absolute;
left: 50%;
top: 50%;
/* 圆角 */
border-radius: 50%;
/* 发光效果
0 x轴方向的长度
0 y轴方向的长度
10 阴影模糊度,只能为正数
4 阴影的扩散半径
*/
box-shadow: 0px 0 10px 4px rgba(255, 255, 255, 1);
animation: animateLx 3s linear infinite;
}
span::before {
content: "";
width: 300px;
height: 3px;
/* 渐变背景 90度,由#fff 向完全透明渐变 */
background: linear-gradient(90deg, #fff, transparent);
position: absolute;
top: 50%;
}
/* 定义动画 ,背景缩放*/
@keyframes animateBg {
0%,
100% {
transform: scale(1);
}
50% {
transform: scale(1.2);
}
}
@keyframes animateLx {
0% {
transform: rotate(315deg) translateX(0);
opacity: 1;
}
90% {
opacity: 1;
}
100% {
transform: rotate(315deg) translateX(-1000px);
opacity: 0;
}
}
span:nth-child(1) {
top: 0px;
right: 0px;
left: initial;
/* 动画延迟时间 */
animation-delay: 0s;
/* 动画时长 */
animation-duration: 1s;
}
span:nth-child(2) {
top: 0px;
right: 80px;
left: initial;
animation-delay: 0.1s;
animation-duration: 3s;
}
span:nth-child(3) {
top: 80px;
right: 0px;
left: initial;
animation-delay: 0.4s;
animation-duration: 2s;
}
span:nth-child(4) {
top: 0px;
right: 10px;
left: initial;
animation-delay: 0.7s;
animation-duration: 2s;
}
span:nth-child(5) {
top: 0px;
right: 400px;
left: initial;
animation-delay: 0.8s;
animation-duration: 2.5s;
}
span:nth-child(6) {
top: 0px;
right: 600px;
left: initial;
animation-delay: 1s;
animation-duration: 3s;
}
span:nth-child(7) {
top: 300px;
right: 0px;
left: initial;
animation-delay: 1.2s;
animation-duration: 1.75s;
}
span:nth-child(8) {
top: 0px;
right: 700px;
left: initial;
animation-delay: 1.4s;
animation-duration: 1.25s;
}
span:nth-child(9) {
top: 0px;
right: 1000px;
left: initial;
animation-delay: 0.75s;
animation-duration: 2.25s;
}
span:nth-child(10) {
top: 0px;
right: 450px;
left: initial;
animation-delay: 2.75s;
animation-duration: 2.25s;
}
</style>
</head>
<body>
<div class="container">
<!--10个span-->
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
</body>
</html>