@keyframes bimg1 {
0% {top: 0;}
100% {top: 200px;}
}
@keyframes bimg2 {
0% {left: 0;}
100% {left: 200px;}
}
#item {
animation: bimg1 2s infinite cubic-bezier(0,0,1,1),bimg2 2s infinite cubic-bezier(0,1,0,1);
width: 10px;
height: 10px;
position: absolute;
background: red;
}

搜一下:怎么做一条运动的弧线 css js h5 svg 都可以
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