css制作收缩圆环旋转效果实例代码

<style>body {  background: #372940;}.demo {  position: relative;  margin: 120px auto;  width: 150px;}.loader {  position: absolute;  opacity: .7;}.loader circle {  -webkit-animation: draw 4s infinite ease-in-out;          animation: draw 4s infinite ease-in-out;  -webkit-transform-origin: center;          transform-origin: center;  -webkit-transform: rotate(-90deg);          transform: rotate(-90deg);}.loader-2 circle,.loader-6 circle {  -webkit-animation-delay: 1s;          animation-delay: 1s;}.loader-7 circle {  -webkit-animation-delay: 2s;          animation-delay: 2s;}.loader-4 circle,.loader-8 circle {  -webkit-animation-delay: 3s;          animation-delay: 3s;}.loader-3 {  left: -150px;  -webkit-transform: rotateY(180deg);          transform: rotateY(180deg);}.loader-6,.loader-7,.loader-8 {  left: -150px;  -webkit-transform: rotateX(180deg) rotateY(180deg);          transform: rotateX(180deg) rotateY(180deg);}.loader-5 circle {  opacity: .2;}@-webkit-keyframes draw {  50% {    stroke-dashoffset: 0;    -webkit-transform: scale(0.5);            transform: scale(0.5);  }}@keyframes draw {  50% {    stroke-dashoffset: 0;    -webkit-transform: scale(0.5);            transform: scale(0.5);  }}  </style>

<div class="demo">  <svg class="loader">    <filter id="blur">      <fegaussianblur in="SourceGraphic" stddeviation="2"></fegaussianblur>    </filter>    <circle cx="75" cy="75" r="60" fill="transparent" stroke="#F4F519" stroke-width="6" stroke-linecap="round" stroke-dasharray="385" stroke-dashoffset="385" filter="url(#blur)"></circle>  </svg>  <svg class="loader loader-2">    <circle cx="75" cy="75" r="60" fill="transparent" stroke="#DE2FFF" stroke-width="6" stroke-linecap="round" stroke-dasharray="385" stroke-dashoffset="385" filter="url(#blur)"></circle>  </svg>  <svg class="loader loader-3">    <circle cx="75" cy="75" r="60" fill="transparent" stroke="#FF5932" stroke-width="6" stroke-linecap="round" stroke-dasharray="385" stroke-dashoffset="385" filter="url(#blur)"></circle>  </svg>  <svg class="loader loader-4">    <circle cx="75" cy="75" r="60" fill="transparent" stroke="#E97E42" stroke-width="6" stroke-linecap="round" stroke-dasharray="385" stroke-dashoffset="385" filter="url(#blur)"></circle>  </svg>  <svg class="loader loader-5">    <circle cx="75" cy="75" r="60" fill="transparent" stroke="white" stroke-width="6" stroke-linecap="round" filter="url(#blur)"></circle>  </svg>  <svg class="loader loader-6">    <circle cx="75" cy="75" r="60" fill="transparent" stroke="#00DCA3" stroke-width="6" stroke-linecap="round" stroke-dasharray="385" stroke-dashoffset="385" filter="url(#blur)"></circle>  </svg>  <svg class="loader loader-7">    <circle cx="75" cy="75" r="60" fill="transparent" stroke="purple" stroke-width="6" stroke-linecap="round" stroke-dasharray="385" stroke-dashoffset="385" filter="url(#blur)"></circle>  </svg>  <svg class="loader loader-8">    <circle cx="75" cy="75" r="60" fill="transparent" stroke="#AAEA33" stroke-width="6" stroke-linecap="round" stroke-dasharray="385" stroke-dashoffset="385" filter="url(#blur)"></circle>  </svg></div>