//非原创， 未找到转载作者地址；开始忘记记录
//多场景应用；css为主，可选择性copy入项目
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<style>
* {
box-sizing: border-box;
}
html, body {
background-color: #000;
}
.radar {
background: -webkit-radial-gradient(center, rgba(0, 0, 0, 0.3) 50%, rgba(233, 40, 35, 0.6) 75%), -webkit-repeating-radial-gradient(rgba(32, 255, 77, 0) 5.8%, rgba(32, 255, 77, 0) 18%, #841413 18.6%, rgba(32, 255, 77, 0) 18.9%), -webkit-linear-gradient(90deg, rgba(32, 255, 77, 0) 49.5%, #841413 50%, #841413 50%, rgba(32, 255, 77, 0) 50.2%), -webkit-linear-gradient(0deg, rgba(32, 255, 77, 0) 49.5%, #841413 50%, #841413 50%, rgba(32, 255, 77, 0) 50.2%);
background: radial-gradient(center, rgba(0, 0, 0, 0.3) 50%, rgba(233, 40, 35, 0.6) 75%), repeating-radial-gradient(rgba(32, 255, 77, 0) 5.8%, rgba(32, 255, 77, 0) 18%, #841413 18.6%, rgba(32, 255, 77, 0) 18.9%), linear-gradient(90deg, rgba(32, 255, 77, 0) 49.5%, #841413 50%, #841413 50%, rgba(32, 255, 77, 0) 50.2%), linear-gradient(0deg, rgba(32, 255, 77, 0) 49.5%, #841413 50%, #841413 50%, rgba(32, 255, 77, 0) 50.2%);
300px;
height: 300px;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
border-radius: 50%;
border: 1px solid #841413;
overflow: hidden;
}
.radar:before {
content: ' ';
display: block;
position: absolute;
100%;
height: 100%;
border-radius: 50%;
}
.radar:after {
content: ' ';
display: block;
background-image: linear-gradient(44deg, rgba(0, 255, 51, 0) 50%, #841413 100%);
50%;
height: 50%;
position: absolute;
top: 0;
left: 0;
animation: radar-beam 5s infinite;
animation-timing-function: linear;
transform-origin: bottom right;
border-radius: 100% 0 0 0;
}
@keyframes radar-beam {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
</style>
<body>
<div class="radar"></div>
</body>
</html>