js图片切换动画

Question

请问用js怎样把这两张图做成动画，走一段距离后，沿原路线返回

做了几次，没做出来

Answer 1

<style>.an{&nbsp; &nbsp; width: 155px;&nbsp; &nbsp; height: 88px;&nbsp; &nbsp; animation: anim 0.6s infinite;}@keyframes anim{&nbsp; &nbsp; from{background-image:url("1.png") ;}&nbsp; &nbsp; to{background-image:url("2.png") ;}}</style><div class="an"></div>