欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识！
您现在的位置是： 首页  >  IT编程

如何使用js实现轮播图

程序员文章站 2022-04-21 17:59:16 
<!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>

上一篇： 微软确认Win10X细节：支持32位应用

下一篇： 现代社会的*方式

推荐阅读