实用CSS3模拟实现一个雷达扫描动画特效

<template>
	<view>
		<view class="leidatu"></view>
	</view>
</template>

<script>
	export default {
		name: 'test'
	}
</script>

<style lang="scss" scoped>
.leidatu {
  background: -webkit-radial-gradient(center, rgba(32, 255, 77, 0.3) 0%, rgba(32, 255, 77, 0) 75%), -webkit-repeating-radial-gradient(rgba(32, 255, 77, 0) 5.8%, rgba(32, 255, 77, 0) 18%, #20ff4d 18.6%, rgba(32, 255, 77, 0) 18.9%), -webkit-linear-gradient(90deg, rgba(32, 255, 77, 0) 49.5%, #20ff4d 50%, #20ff4d 50%, rgba(32, 255, 77, 0) 50.2%), -webkit-linear-gradient(0deg, rgba(32, 255, 77, 0) 49.5%, #20ff4d 50%, #20ff4d 50%, rgba(32, 255, 77, 0) 50.2%);
  background: radial-gradient(center, rgba(32, 255, 77, 0.3) 0%, rgba(32, 255, 77, 0) 75%), repeating-radial-gradient(rgba(32, 255, 77, 0) 5.8%, rgba(32, 255, 77, 0) 18%, #20ff4d 18.6%, rgba(32, 255, 77, 0) 18.9%), linear-gradient(90deg, rgba(32, 255, 77, 0) 49.5%, #20ff4d 50%, #20ff4d 50%, rgba(32, 255, 77, 0) 50.2%), linear-gradient(0deg, rgba(32, 255, 77, 0) 49.5%, #20ff4d 50%, #20ff4d 50%, rgba(32, 255, 77, 0) 50.2%);
  width: 500px;
  height: 500px;
  position: relative;
  left: 50%;
  top: 50%;
  // transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid #0cdd36;;
  overflow: hidden;
}
.leidatu:after {
  content: ' ';
  display: block;
  background-image: linear-gradient(44deg, rgba(0, 255, 51, 0) 50%, #00bb22 100%);
  width: 50%;
  height: 50%;
  position: absolute;
  top: 0;
  left: 0;
  animation: zhuan 5s infinite;
  animation-timing-function: linear;
  transform-origin: bottom right;
  border-radius: 100% 0 0 0;
}
 
@keyframes zhuan {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
 
</style>

方法二:雷达扫描动画特效(filter阴影效果)

<template>
	<div>
		<div class="loader">
			<span></span>
		</div>
	</div>
</template>

<script>
</script>

<style lang="scss">
	.loader {
		width: 150px;
		height: 150px;
		background: transparent;
		display: flex;
		justify-content: center;
		align-items: center;
		position: relative;
		box-shadow: 25px 25px 75px rgba(0,0,0,0.55);
		border-radius: 50%;
		overflow: hidden;
	}
	.loader::before {
		content: "";
		position: absolute;
		inset: 20px;
		background: transparent;
		border: 1px dashed #444;
		border-radius: 50%;
		box-shadow: inset -5px -5px 25px rgba(0,0,0,0.25),inset 5px 5px 35px rgba(0,0,0,0.25)
	}
	.loader::after {
		content: "";
		position: absolute;
		width: 50px;
		height: 50px;
		border: 1px dashed #444;
		border-radius: 50%;
		box-shadow: inset -5px -5px 25px rgba(0,0,0,0.25),inset 5px 5px 35px rgba(0,0,0,0.25)
	}
	.loader span {
		width: 100%;
		height: 100%;
		background: transparent;
		position: absolute;
		top: 50%;
		left: 50%;
		border-top: 1px solid #fff;
		animation: radar 2s linear infinite;
		transform-origin: top left; 
	}
	.loader span::before {
		content: "";
		position: absolute;
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
		background: seagreen;
		filter: blur(30px) drop-shadow(20px 20px 20px seagreen);
		transform-origin: top left;
		transform: rotate(-55deg);
		border: 1px solid red;
	}
	@keyframes radar {
		0% {
			transform: rotate(0deg);
		}
		100% {
			transform: rotate(360deg);
		}
	}
</style>