<style>
*{
margin:0;
padding:0;
/* box-sizing: border-box; */
}
ul{
list-style: none;
}
#nav{
width:900px;
height:100px;
border:2px solid rgb(70, 69, 69);
margin:100px auto;
overflow: hidden;
}
#nav ul{
animation:moving 5s linear infinite;
width:200%; /*怎么模拟动画无线滚动，关键点在这，因为当动画滚动完之后，ul会回到起始位置，如果设置宽度为大盒子的2倍则在视觉上不会出现回到初始位置重新滚动的问题*/
}
#nav ul li{
float:left;
}
#nav ul li img{
width:100px;
height: 100px;
}
/* 自定义动画 */
@keyframes moving{
from{
transform:translateX(0)
}
to{
transform: translateX(-900px);
}
}
#nav:hover ul{ /*鼠标移入正在运行的动画停止*/
animation-play-state:paused ;
}
</style>
<div id="nav">
<ul>
<!-- 将图片复制两份，保证每份图片的宽跟 nav盒子的宽度相同 -->
<!-- 第一份 -->
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<!-- 第二份 -->
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
<li><img src="https://img0.baidu.com/it/u=1032314795,3433105171&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" alt=""></li>
</ul>
</div>
