<ul>
  <li><img src="images/ad1.jpg" alt="图片"></li>
  <li><img src="images/ad2.jpg" alt="图片"></li>
  <li><img src="images/ad3.jpg" alt="图片"></li>
  <li><img src="images/ad4.jpg" alt="图片"></li>
  <li><img src="images/ad5.jpg" alt="图片"></li>
  <li><img src="images/ad6.jpg" alt="图片"></li>
</ul>

<style>
 ul,li{list-style:none; padding:0; margin:0;}
 ul{width:960px; height:300px; margin:100px auto; border:1px solid #000; overflow:hidden;}
 ul li{
width:160px;
height:300px;
float:left;
background-color:red;
transition-property:width;
transition-duration:1s;
}
ul:hover li{
width:58px;
}
ul li:hover{
width:670px
} 
</style>；