css3实现椭圆轨迹旋转的示例代码

 .ball {
    animation: 
      animX 2s linear  infinite alternate,
      animY 2s linear  infinite alternate
  }
@keyframes animX{
      0% {left: 0px;}
    100% {left: 500px;}
}
@keyframes animY{
      0% {top: 0px;}
    100% {top: 300px;}
}

 .ball {
    animation: 
      animX 2s linear 0s infinite alternate,
      animY 2s linear -1s infinite alternate
  }

 .ball {
    animation: 
      animX 2s  cubic-bezier(0.36, 0, 0.64, 1) -1s infinite alternate,
      animY 2s cubic-bezier(0.36, 0, 0.64, 1) 0s infinite alternate
  }

.ball1 {
    animation: 
      animX 2s  cubic-bezier(0.36, 0, 0.64, 1) -1s infinite alternate,
      animY 2s cubic-bezier(0.36, 0, 0.64, 1) 0s infinite alternate,
      scale 4s cubic-bezier(0.36, 0, 0.64, 1) 0s infinite alternate;
  }
 @keyframes scale {

    0% {
      transform: scale(0.7)
    }
    50% {
      transform: scale(1)
    }
    100% {
      transform: scale(0.7)
   }
 }