1.效果图,重点opacity,animation,transform:scale

2.html

<div class="icon-warnCom"><icon class="icon-warns"><i class="dot"></i><i class="pulse"></i></icon></div><div class="icon-warnCom1"><icon class="icon-warns"><i class="dot"></i><i class="pulse"></i></icon></div><div class="icon-warnCom2"><icon class="icon-warns"><i class="dot"></i><i class="pulse"></i></icon></div>

3.css

 body {width: 100%;height: 100%;background-color: black;}@keyframes warn {0% {transform: scale(0);opacity: 0.0;}25% {transform: scale(0);opacity: 0.1;}50% {transform: scale(0.1);opacity: 0.3;}75% {transform: scale(0.2);opacity: 0.5;}100% {transform: scale(0.3);opacity: 0.0;}}.icon-warnCom {position: absolute;width: 12px;height: 12px;background-color: #ffd803;border-radius: 100%;top: 100px;left: 100px;}.icon-warns {position: relative;width: 100%;height: 100%;display: block;}/* 保持大小不变的小圆圈  */.dot {position: absolute;left: -44px;top: -44px;width: 60px;height: 60px;-webkit-border-radius: 100;-moz-border-radius: 100;border: 20px solid #f6c100;border-radius: 100%;z-index: 2;opacity: 0;-webkit-animation: warn 2.5s ease-out;-moz-animation: warn 2.5s ease-out;animation: warn 2.5s ease-out;-webkit-animation-iteration-count: infinite;-moz-animation-iteration-count: infinite;animation-iteration-count: infinite;}/* 产生动画（向外扩散变大）的圆圈  */.pulse {position: absolute;left: -44px;top: -44px;width: 60px;height: 60px;border: 20px solid #f6c100;-webkit-border-radius: 100%;-moz-border-radius: 100%;border-radius: 100%;z-index: 1;opacity: 1;-webkit-animation: warn 1.5s ease-out;-moz-animation: warn 1.5s ease-out;animation: warn 1.5s ease-out;-webkit-animation-iteration-count: infinite;-moz-animation-iteration-count: infinite;animation-iteration-count: infinite;}.icon-warnCom1 {position: absolute;width: 12px;height: 12px;background-color: #ffd803;border-radius: 100%;top: 50px;left: 50px;}.icon-warnCom2 {position: absolute;width: 12px;height: 12px;background-color: #ffd803;border-radius: 100%;top: 100px;left: 50px;}