简单脉冲动画效果实现

效果展示

在这里插入图片描述

CSS 知识点

CSS 变量的灵活使用
CSS 动画使用

页面整体结构实现

<div class="pulse">
  <span style="--i: 1"></span>
  <span style="--i: 2"></span>
  <span style="--i: 3"></span>
  <span style="--i: 4"></span>
  <span style="--i: 5"></span>
  <span style="--i: 6"></span>
</div>

实现整体布局

.pulse {
  position: relative;
  width: 200px;
  height: 200px;
  box-shadow: inset 0 0 40px #12b9ff, 0 0 50px #12b9ff;
  border-radius: 50%;
  border: 1px solid #12b9ff;
  background: url(./earch.jpg);
  background-size: cover;
}

.pulse span {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: transparent;
  border: 1px solid #12b9ff;
  border-radius: 50%;
}

使用CSS变量和动画实现脉冲效果

.pulse span {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: transparent;
  border: 1px solid #12b9ff;
  animation: animate 6s linear infinite;
  border-radius: 50%;
  animation-delay: calc(var(--i) * -1s);
}

@keyframes animate {
  0%{
    width: 200px;
    height: 200px;
    opacity: 1;
  }
  50% {
    opacity: 1;
  }
  100% {
    width: 600px;
    height: 600px;
    opacity: 0;
  }
}

实现地球运动效果

.pulse {
  position: relative;
  width: 200px;
  height: 200px;
  box-shadow: inset 0 0 40px #12b9ff, 0 0 50px #12b9ff;
  border-radius: 50%;
  border: 1px solid #12b9ff;
  background: url(./earch.jpg);
  background-size: cover;
  animation: animateEarth 30s linear infinite;
}

@keyframes animateEarth {
  0% {
    background-position-x: 0px;
  }
  100% {
    background-position-x: 2400px;
  }
}