漫漫长夜

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        #box{
            width: 800px;
            height: 380px;
            margin: 30px auto;
            position: relative;
        }
        #box .item{
            display: none;
        }
        #box .active{
            display: block;
        }
        #box .dots{
            position: absolute;
            left: 50%;
            bottom: 15px;
            transform: translateX(-50%);
            list-style: none;
        }
        #box .dots li{
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            border: 1px solid #eee;
            margin-right: 16px;
        }
        #box .dots .active{
            background: #eee;
        }

        #box .arrow{
            position: absolute;
            top: 50%;
            display: block;
            width: 24px;
            height: 24px;
            background-size:24px 24px;
            transform: translateY(-50%);
        }
        #box .left{
            left: 20px;
            background-image: url(images/arrow-left.png);
        }
        #box .right{
            right: 20px;
            background-image: url(images/arrow-right.png);
        }
        .right:hover{
            cursor: pointer;
        }
        .left:hover{
            cursor: pointer;
        }
        .dots li:hover{
            cursor: pointer;
        }
    </style>
</head>
<body>
<div id="box">
    <div class="pics">
        <div class="item active">
            <img src="images/001.jpg" alt="">
        </div>
        <div class="item">
            <img src="images/002.jpg" alt="">
        </div>
        <div class="item">
            <img src="images/003.jpg" alt="">
        </div>
        <div class="item">
            <img src="images/004.jpg" alt="">
        </div>
    </div>
    <ul class="dots">
        <li class="active"></li>
        <li></li>
        <li></li>
        <li></li>
    </ul>
    <span class="arrow left"></span>
    <span class="arrow right"></span>
</div>

<script>
    var index=0;
    var pics=document.getElementsByClassName("item");
    var lis =document.getElementsByClassName("dots")[0].getElementsByTagName("li");

    function changeNext() {
        pics[index].className="item";
        lis[index].className="";
        index++;
        index=index%pics.length;
        pics[index].className="item active";
        lis[index].className="active";
    }
    var t=setInterval(changeNext,3000);

    document.getElementsByClassName("right")[0].onclick=function () {
        changeNext();
    };
    document.getElementsByClassName("left")[0].onclick=function () {
        pics[index].className="item";
        lis[index].className="";
        lis[index].className="";
        index=(index+pics.length-1)%pics.length;
        pics[index].className="item active";
        lis[index].className="active";
    };

    document.getElementById("box").onmouseover=function () {
        clearInterval(t);
    };

    document.getElementById("box").onmouseout=function () {
        t=setInterval(changeNext,3000);
    };
    for(var i=0; i<lis.length;i++){
        lis[i]._index = i;
        lis[i].onclick=function () {
          var j=this._index;
          lis[index].className="";
          lis[j].className="active";

          pics[index].className="item";
          pics[j].className="item active";
          index=j;
        };
    }
</script>
</body>
</html>
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