animation:mymove 5s linear infinite;
@keyframes mymove { from {left:0px;} to {left:200px;} }
用时5秒，均速，无限播放

animation:mymove 5s linear 2s 2;
@keyframes mymove { from {left:0px;} to {left:200px;} }
用时5秒，均速，延迟2秒，播放2次