掘金头像旋转动画
参考文章或者地址
文章 
掘金头像地址
 模仿地址
 
代码实现
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   |  <div class="avatar"></div>
 
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   |  .avatar {   width: 100px;   height: 100px;   border-radius: 50%;   overflow: hidden;   margin: 0 auto;   background-image: url(https://avatars2.githubusercontent.com/u/24250627?s=460&v=4);   background-size: cover; }
  .avatar:hover {   -webkit-transform: rotate(666turn);   transform: rotate(666turn);   transition-delay: 1s;   transition-property: all;   transition-duration: 59s;   transition-timing-function: cubic-bezier(.34, 0, .84, 1) }
 
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资料参考
turn
转、圈(Turns)。一个圆共1圈
90deg = 100grad = 0.25turn ≈ 1.570796326794897rad
资料有兼容说明