部分功能没有实现 只是让图片动起来了

<style>
			*{
				margin: 0;
				padding: 0;
				list-style: none;
				
			}
			
			img{
				vertical-align: top;
			}
			
			#box{
				width: 800px;
				height: 460px;
				border: 2px solid gainsboro ;
				margin: 100px  auto ;
				overflow: hidden;
				position: relative;
				cursor: pointer;
			}
			ul{
				width: 4000px;
				height: 100%;
			
				position: absolute;
				left: -800px;
			
			}
			ul li {
				float: left
			}
			span{
				display: inline-block;
				width: 44px;
				height: 44px;
				border: 1px solid;
				border-radius: 100%;
				text-align: center;
				line-height: 44px;
				font-size: 30px;
				font-weight: bold;
				 cursor: pointer;
				 z-index: 1000;
			}
			#span1{
				position: absolute;
				left: 580px;
				top: 320px;
			}
			#span2{
				
				position: absolute;
				left: 1284px;
				top: 320px;
				
			}
		</style>
	
	<body>
		<div id="box">
		<ul id="ul">
			<li><img src="img/poster-1.jpg" alt="" /></li>
			<li><img src="img/poster-2.jpg" alt="" /></li>
			<li><img src="img/poster-3.jpg" alt="" /></li>
			<li><img src="img/poster-4.jpg" alt="" /></li>
			<li><img src="img/poster-5.jpg" alt="" /></li>
		</ul>
		
	</div>
	
	<span style="display: none;" id="span1" >
		<
	</span>
	<span style="display: none;" id="span2">></span>
	
	<script>
		window.onload=function(){
			var ul=document.getElementById("ul");
			 var timer; index=0;
			var box=document.getElementById("box");
			var span1=document.getElementById("span1");
			var span2=document.getElementById("span2");

			box.onmouseover=function(){	
				span1.style.display="block";
				span2.style.display="block";
			}
			
			box.onmouseout=function(){
				
				span1.style.display="none";
				span2.style.display="none";
			}
			 
			 //启动定时器
			 timer=setInterval(run,1000);
			 function run(){
			 	ul.style.left=-(index*800)+"px";
			 	index++;
			 	if(index>4){
			 		index=0;
		 	}
		}
			 
	}
		
		
	</script>