如何使用js实现轮播图

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>图片切换</title>
    <style>
        .picture {
            position: relative;
            width: 500px;
            height: 333px;
            margin: 0 auto;
            border: 2px solid rgb(231, 127, 217);
            overflow: hidden;
        }

        .radius {           /* 圆点所在的p (容器)  */
            width: 100%;
            height: 10px;
            position: absolute;
            bottom: 30px;
            text-align: center;
        }

        .p
        g {
            position: absolute;
            margin: 0;
            width: 100%;
            height: 20px;
            background-color: rgba(0, 0, 0, .4);
            text-align: center;
            font-size: 16px;
            font-weight: 600;
            color: #fff;
        }

        .title {
            position: absolute;
            width: 100%;
            bottom: 0px;
            text-align: center;
            font-size: 16px;
            font-weight: 600;
            color: rgb(21, 223, 72);
        }

        span {
            display: inline-block;
            border: 10px solid #fdfdfd;
            border-radius: 50%;
        }

        .active {
            border: 10px solid #656466;
        }

        /* 左右箭头  */
        .arrowhead-left,
        .arrowhead-right {
            position: absolute;
            width: 41px;
            height: 69px;
            font-size: 30px;
            line-height: 70px;
            text-align: center;
            color: #D6D8D4;
            background-color: rgba(0,0,0,.3);
        }

        .arrowhead-left {
            left: 0;
            top: 40%;
        }

        .arrowhead-right {
            right: 0;
            top: 40%;
        }
    </style>
</head>

<body>
<div class="picture">
    <!-- 图片页码 -->
    <p class="pg">封面</p>
    <img src="./image/d8.jpeg" alt="">

    <!-- 小圆点点 -->
    <p class="radius"></p>
    <!-- 图片的下面标题 -->
    <p class="title">标题</p>

    <!-- 左右箭头 -->
    <div class="arrowhead-left" id="al"> < </div>
    <div class="arrowhead-right" id="ar"> > </div>
</div>

<script>
    var address = ["./image/d1.jpeg", "./image/d2.jpeg", "./image/d3.jpeg", "./image/d4.jpeg", "./image/d5.jpeg", "./image/d7.jpeg"];
    //  var imgs = document.getElementsByTagName("img");
    var imgs = document.querySelector("img");
    var len = address.length;               //图片地址的数量为len
    var str = "";
    var pp = document.getElementsByTagName("p");//获取的是p标签的集合
    //  var pp  = document.querySelector("p");    //获取的是一个元素
    var al = document.getElementById("al");
    var ar = document.getElementById("ar");
    var n = 0 ;

    //添加span标签（小圆点），个数为len个
    for (i = 0; i < len; i++) {
        str += ' <span></span>'
    }
    pp[1].innerHTML = str;

    var spans = pp[1].getElementsByTagName('span');  //获取p[1]里所有span标签
    spans[0].className = 'active';                  //给第一个span标签添加样式 active

    for (i = 0; i < len; i++) {
        spans[i].index = i;              //自定义索引值

        spans[i].onmouseover = function () {            //鼠标指向圆点时的事件
            for (i = 0; i < len; i++) {
                spans[i].className = "";               //通过循环，清除所有圆点的类名
            }
            n=this.index ;
            this.className = 'active';                 //给鼠标移入的圆点添加类名
            imgs.src = address[this.index];
            pp[0].innerHTML = [this.index + 1] + "/6";
            pp[2].innerHTML = "风光" + [this.index + 1];

        }

    }

    ar.onclick = function () {            //右侧箭头，点击一次图片向右换一张
        n++;
        if (n>5) {
            n=0;
        }
        for (i = 0; i < len; i++) {
            spans[i].className = "";
        }

        spans[n].className = "active";
        imgs.src = address[n];
        pp[0].innerHTML = (n+1) + "/6";
        pp[2].innerHTML = "风光" +(n+1);

    }

    al.onclick = function () {        // //左侧箭头，点击一次图片向左换一张
        n--;
        if (n<0) {
            n=(len-1);
        }
        for (i = 0; i < len; i++) {
            spans[i].className = "";
        }
        spans[n].className = "active";
        imgs.src = address[n];
        pp[0].innerHTML = (n+1) + "/6";
        pp[2].innerHTML = "风光" +(n+1);
    }

    setInterval(ar.onclick,3000);             //添加定时器  setInterval（函数，间隔时间单位为毫秒）
                                              //此次添加的函数为点击右侧箭头，间隔为3秒
</script>
</body>

</html>
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如何使用js实现轮播图

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