CSS animation 文档
效果图
闪烁效果图
介绍
animation 属性是一个简写属性，用于设置六个动画属性：
animation-nameanimation-durationanimation-timing-functionanimation-delayanimation-iteration-countanimation-direction
语法
animation: name duration timing-function delay iteration-count direction;
源码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>animation</title>
</head>
<style>
.point {
width: 50px;
height: 50px;
background-color: #2ea598;
position: relative;
border-radius: 50%;
}
/* 设置动画前颜色 */
.point-flicker:after {
background-color: #2ea598;
}
/* 设置动画后颜色 */
.point-flicker:before {
background-color: rgba(0, 168, 253, 0.2);
}
/* 设置动画 */
.point-flicker:before,
.point-flicker:after {
content: '';
width: 80px;
height: 80px;
position: absolute;
left: 50%;
top: 50%;
margin-left: -40px;
margin-top: -40px;
border-radius: 50%;
animation: warn 1.5s ease-out 0s infinite;
}
@keyframes warn {
0% {
transform: scale(0.5);
opacity: 1;
}
30% {
opacity: 1;
}
100% {
transform: scale(1.4);
opacity: 0;
}
}
</style>
<body>
<div class="point point-flicker"></div>
</body>
<script>
</script>
</html>
补充
如需修改在页面中的位置
将 .point 设为 position:absoulute ,修改其left , top 位置即可
.point-flicker 是相对 .point 来定位的
修改大小时要将它的margin-left: -40px; margin-top: -40px;改为对应大小的一半
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