图片轮播效果

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>ECharts</title>
    <style>
        /* 主体部分 */
        *{
            margin: 0;
            padding: 0;
            list-style: none;
        }
        img{
            width: 680px;
            height: 340px;
        }
        #slider{
           position: relative;
            width: 680px;
            height: 340px;
            margin: 100px auto;
            /* outline: 2px solid red; */
            overflow: hidden;
        }
        .slider-list{
            display: flex;
            position: relative;
            left: 0px;
            width: 100%;
            height: 100%;
            /* transform: translateX(-680px); */
            transition: all 1s;
        }
        .slider-list li{
            width: 680px;
            height: 340px;
        }
        /* 小点部分 */
        .dot-list{
           position: absolute;
           bottom: 10px;
          left: 50%;
          transform: translateX(-50%);
          padding: 2px 10px;
          border-radius: 12px;
          background-color: rgba(255, 255, 255, .3);
        }
        .dot-list .dot{
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: white;
        }
        .dot-list .dot.cur{
            background-color: red;
        }
        /*箭头部分  */
        .arraw{
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 30px;
            height: 60px;
            background-color: rgba(0, 0, 0, 0.795);
            display: none;
        }
        .prev{
            left: 0;
        }
        .next{
            right: 0;
        }
        .arraw span{
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(50%,50%);
            width: 10px;
            height: 10px;
            border-bottom:2px solid white;
            border-left:2px solid white;
        }
        .prev span{
            transform: translate(-50%,-50%) rotate(45deg);
        }
        .next span{
            transform: translate(-50%,-50%) rotate(-135deg);
        }
        #slider:hover .arraw{
            display: block;
        }
    </style>
  </head>
  <body>
    <div id="slider">
        <!-- 图片部分 -->
        <ul class="slider-list">
            <!-- <li><a href="#"><img src="./img/5.jpg"></a></li> -->
            <li><a href="#"><img src="./img/demo1.jpg"></a></li>
            <li><a href="#"><img src="./img/demo2.jpg"></a></li>
            <li><a href="#"><img src="./img/demo3.jpg"></a></li>
            <li><a href="#"><img src="./img/demo4.jpg"></a></li>
            <li><a href="#"><img src="./img/demo5.jpg"></a></li>
            <li><a href="#"><img src="./img/demo1.jpg"></a></li>
        </ul>
         <!-- 小点部分 -->
       <div class="dot-list">
        <span class="dot cur"></span>
        <span class="dot"></span>
        <span class="dot"></span>
        <span class="dot"></span>
        <span class="dot"></span>
    </div>
    <!--箭头布分 -->
    <a href="#" class="arraw prev" id="left">
        <span></span>
    </a>
    <a href="#" class="arraw next" id="right">
     <span></span>
    </a>
         
    </div>
    <script>
         var slid =document.getElementById('slider');
            var slidLis=slid.getElementsByTagName('ul')[0];
            // var slidLis=document.querySelector(".slider-list")
            var slidLi=slidLis.getElementsByTagName('li');
          
            var lef = document.getElementById('left');
            var righ = document.getElementById('right');
             
            var index = 0;
            function lun(){
               index++;
                circe();
               slidLis.style.left=index*-680 + "px";
               slidLis.style.transition="all 1s";
               if(index === 5){
                   index= 0;
                   setTimeout(function(){
                       slidLis.style.left=0;
                       slidLis.style.transition="none";
                   },1000)
               }
               circe();
            }
            righ.addEventListener("click",lun);
            lef.addEventListener("click",function(){
                index--;
                if(index === -1){
                    slidLis.style.left=5*-680 + "px";
                    slidLis.style.transition="none";
                     index = 4;
                    setTimeout(function(){
                        slidLis.style.left=index*-680 + "px";
                    slidLis.style.transition="all 1s";
                    },0);  
                }else{
                    slidLis.style.left=index*-680 + "px";
                }
                circe();
            });
        //  自动轮播
        var autoplay = setInterval(lun,2000);
        slid.addEventListener("mouseenter",function(){
            clearInterval(autoplay);
        });
        slid.addEventListener("mouseleave",function(){
            clearInterval;
            autoplay = setInterval(lun,2000);
        })
          
        //小圆点
          
        var dotList = document.getElementsByTagName('span');
        function circe(){
            for(var i = 0;i < dotList.length;i++){
                  if(i === index){
                      dotList[i].classList.add("cur");
                  }else{
                    dotList[i].classList.remove("cur"); 
                  }
            }
        }
    </script>
  </body>
</html>