轮播图代码,带定时器和小圆圈(易懂)

萧寂173
110 阅读1分钟

简单的显示隐藏(带小圆圈和左右按钮,js写)

<!DOCTYPE html>
<html lang = "en" >
<head >
    <meta charset = "UTF-8" >
    <meta content = "IE=edge" http-equiv = "X-UA-Compatible" >
    <meta content = "width=device-width, initial-scale=1.0" name = "viewport" >
    <title >Document</title >
    <script src = "https://code.jquery.com/jquery-3.6.0.min.js" ></script >
    <style >
        * {
            padding: 0;
            margin: 0;
            list-style: none;
            text-decoration: none;
        }

        section {
            width: 100%;
            height: 500px;
            position: relative;
        }

        main {
            width: 300px;
            height: 200px;
            border: 1px solid;
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
        }

        div {
            width: 300px;
            height: 200px;
            display: none;
        }

        .xs {
            display: block;
        }

        main > a:nth-child(1) {
            position: absolute;
            left: 0;
            top: 50%;
        }

        main > a:nth-child(2) {
            position: absolute;
            right: 0;
            top: 50%;
        }

        ul {
            display: flex;
            position: absolute;
            bottom: 0;
        }

        li {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            border: 1px solid;
            background-color: #ccc;
        }

        .red {
            background-color: red;
        }

        a {
            width: 20px;
            height: 20px;
            opacity: 0;
            color: white;
        }

        div:nth-of-type(1) {
            background-color: khaki;
        }
        h2{
            color: white;
        }
        div:nth-of-type(2) {
            background-color: deepskyblue;
        }

        div:nth-of-type(3) {
            background-color: blue;
        }

        div:nth-of-type(4) {
            background-color: yellow;
        }

        div:nth-of-type(5) {
            background-color: pink;
        }

        div:nth-of-type(6) {
            background-color: green;
        }

        div:nth-of-type(7) {
            background-color: orange;
        }
        div:nth-of-type(8){
            background-color: darkviolet;
        }





    </style >
</head >
<body >
<section >
    <main >
        <a href = "javascript:;" >&lt;</a >
        <a href = "javascript:;" >&gt;</a >
        <div class = "xs" ><h2 >第一张图片信息</h2 ></div >
        <div ><h2 >第二张图片信息</h2 ></div >
        <div ><h2 >第三张图片信息</h2 ></div >
        <div ><h2 >第四张图片信息</h2 ></div >
        <div ><h2 >第五张图片信息</h2 ></div >
        <div ><h2 >第六张图片信息</h2 ></div >
        <div ><h2 >第七张图片信息</h2 ></div >
        <div ><h2 >第八张图片信息</h2 ></div >
        <ul >
        </ul >
    </main >
    </section >
<script >
    var zb = document.querySelector("main>a:nth-child(1)")
    var a = document.querySelectorAll("a")
    var yb = document.querySelector("main>a:nth-child(2)")
    var main = document.querySelector("main")
    var div = document.querySelectorAll("div")
    var ul = document.querySelector("ul")
    //index控制图片的索引号
    let index = 0;
    //xj控制小圆圈
    var xj = 0;

    //块元素显示隐藏的排他思想
    function tupian() {
        document.querySelector(".xs").classList.remove("xs")
        div[index].classList.add("xs")
    }

    // for循环动态创建小圆圈
    for (let i = 0; i < div.length; i++) {
        //新创建的li标签
        var li = document.createElement("li")
        //将新标签追加到ul里面
        ul.appendChild(li)
        //设置index自定义属性，属性值为块的索引号
        li.setAttribute('index', i);
        //给新创建的元素一个点击事件，(不用for循环，这里的li指每一个元素)
        li.addEventListener("click", function () {
            //通过for循环，进行排他思想，将其他元素的样式去掉
            for (var j = 0; j < ul.children.length; j++) {
                //双引号必须有个空格
                ul.children[j].className = " "
            }
            //给当前被点击的元素添加样式
            this.className = "red"
            //获取刚刚创建的自定义属性的值，将值赋给index块的索引
            index = this.getAttribute("index")
            //调用图片的排他思想函数，使点击小圆圈，图片能跟着变化
            xj = index
            tupian()
        })
    }
    //给第一个元素添加默认样式
    ul.children[0].className = "red"
    //左侧按钮
    zb.addEventListener("click", function () {
        //块索引变化，小圆圈索引也变化，两者一一对应长度相等，可以共用div.length
        index--;
        xj--;
        //当索引小于0时，让这两个元素索引改为最大索引
        if (index < 0) {
            index = div.length - 1
            xj = div.length - 1
        }
        for (var j = 0; j < ul.children.length; j++) {
            //还是小圆圈的排他思想，双引号必须有个空格，点击左右按钮时小圆圈也发生变化
            ul.children[j].className = " "
        }
        ul.children[xj].className = "red"
        //最后调用块变化的函数
        tupian()
    })
    //右侧按钮
    yb.addEventListener("click", function () {
        index++;
        xj++;
        //当索引大于于div.length-1时，让这两个元素索引改为最小索引
        if (index > div.length - 1) {
            index = 0;
            xj = 0
        }
        for (var j = 0; j < ul.children.length; j++) {
            //还是小圆圈的排他思想，双引号必须有个空格，点击左右按钮时小圆圈也发生变化
            ul.children[j].className = " "
        }
        ul.children[xj].className = "red"
        //最后调用块变化的函数
        tupian()
    })
    //用定时器调用右侧按钮的点击效果，每一秒动一次
    let temer = setInterval(function () {
        yb.click()
    }, 1000)
    //当悬浮到main标签上，定时器停止
    main.addEventListener("mouseover", function () {
        //鼠标移入，箭头出现
        zb.style.opacity = "1"
        yb.style.opacity = "1"
        clearInterval(temer)
    })
    //当离开到main标签，定时器继续打开
    main.addEventListener("mouseout", function () {
        //鼠标移出，箭头消失
        zb.style.opacity = "0"
        yb.style.opacity = "0"
        temer = setInterval(function () {
            yb.click()
        }, 1000)
    })
</script >
</body >
</html >

简单的轮播图(无左右按钮和小圆圈,简单切换隐藏显示,jq写的)

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="">
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
            text-decoration: none;
        }

        .swiper {
            width: 400px;
            height: 300px;
            position: relative;
        }

        .swiper img {
            width: 100%;
            height: 100%;
            position: absolute;
            opacity: 0;
            transition: all 1s;
        }

        img.activeImg {
            opacity: 1;
        }
    </style>
</head>

<body>
    <main class="swiper">
        <img class="activeImg" src="../../../01-JQuary练习/jq学习/images/冬裙.jpg" alt="">
        <img src="../../../01-JQuary练习/jq学习/images/呢大衣.jpg" alt="">
        <img src="../../../01-JQuary练习/jq学习/images/围巾.jpg" alt="">
        <img src="../../../01-JQuary练习/jq学习/images/女包.jpg" alt="">
    </main>
    <script>
        let imgIndex = 0;//图片下标
        let timer = null;
        function play() {
            //0上一个隐藏
            $(".swiper img").eq(imgIndex).removeClass("activeImg");
            imgIndex++;
            if (imgIndex == $(".swiper img").length) {
                imgIndex = 0;//边界判断
            }
            //下一个显示
            $(".swiper img").eq(imgIndex).addClass("activeImg");
        }
        timer = setInterval(play, 1000)
    </script>
</body>

</html>

下面这个是jQuery写的无缝轮播图,非隐藏显示,带左右按钮和圆圈

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="">
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        ul,
        ol {
            list-style: none;
        }

        .box {
            width: 800px;
            height: 500px;
            margin: 0 auto;
            position: relative;
            overflow: hidden;
            box-shadow: 2px 2px 15px #333;
        }

        ul {
            height: 100%;
            position: absolute;
            display: flex;
        }

        li,
        li>img {
            width: 800px;
            height: 100%;
        }

        button {
            width: 70px;
            height: 50px;
            position: absolute;
            z-index: 10;
            top: calc(50% - 25px);
            font-size: 16px;
            opacity: 0;
            transition: all .5s;
        }

        .right {
            right: 0;
        }

        .box:hover button {
            opacity: 1;
        }

        ol {
            width: 120px;
            margin: 0 auto;
            position: absolute;
            bottom: 20px;
            left: calc(50% - 60px);
            display: flex;
            justify-content: space-between;
        }

        ol li {
            width: 10px;
            height: 10px;
            background-color: gray;
            border-radius: 5px;
        }

        .ac {
            width: 25px;
            background-color: blue;
            transition: all 1s;
        }
    </style>
</head>

<body>
    <div class="box">
        <ul>
            <!-- <li><img src="../../../01-JQuary练习/jq学习/images/棉服.jpg" alt=""></li> -->
            <li><img class="activeImg" src="../../../01-JQuary练习/jq学习/images/冬裙.jpg" alt=""></li>
            <li><img src="../../../01-JQuary练习/jq学习/images/呢大衣.jpg" alt=""></li>
            <li><img src="../../../01-JQuary练习/jq学习/images/围巾.jpg" alt=""></li>
            <li><img src="../../../01-JQuary练习/jq学习/images/女包.jpg" alt=""></li>
            <li><img src="../../../01-JQuary练习/jq学习/images/棉服.jpg" alt=""></li>
            <li><img class="activeImg" src="../../../01-JQuary练习/jq学习/images/冬裙.jpg" alt=""></li>
        </ul>
        <button class="left">left</button>
        <button class="right">right</button>
        <ol class="dots">
            <li class="ac"></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ol>
    </div>

    <script>
        let width = $("img").width();
        console.log(width);//800,img标签的宽
        let index = 0;//记录当前图片的下标
        let imglen = $("img").length - 1;//图片个数
        console.log(imglen);
        let timer;//记录定时器
        let flag = false;//自动轮播的记录节流阀

        //小圆点排他方法
        function dotCHange(index) {
            $("ol li").removeClass("ac");
            $("ol li").eq(index).addClass("ac")
        }

        //自动播放
        function play() {
            if (flag) {
                return;//如果动画尚未结束,不给点击
            }
            flag = true;//能往下执行,表示接下来有动画开始了
            index++;//-1*800/-2*800
            //边界判断
            if (index == imglen) {
                $("ul").animate({
                    left: -index * width
                }, 1000, function () {
                    //最后一张图片动画执行完成时,立即闪现\瞬移到第一张图片
                    $("ul").css("left", 0)
                    flag = false;
                })
                index = 0//初始化
            } else {
                $("ul").animate({
                    left: -index * width
                }, 1000, function () {
                    flag = false;
                })
            }

            //小圆圈判断
            dotCHange(index)
        }
        timer = setInterval(play, 1000)


        $(".box").hover(function () {
            clearInterval(timer);
            timer = null;
        }, function () {
            timer = setInterval(play, 1000)
        })


        //点击圆点切换图片
        $("ol li").click(function () {
            let dotidx = $(this).index();//获取当前下标
            index = dotidx;//将点击的位置作为当前下标
            console.log(dotidx);
            $("ul").stop().animate({//根据下标显示对应图片,并且多次点击停止上次动画
                left: -dotidx * width
            }, 1000)
            dotCHange(dotidx)//排他
        })


        //右键点击
        $(".right").on("click", function () {
            play();
        })

        //左键点击
        $(".left").on("click", function () {
            if (flag) {
                return;//如果动画尚未结束,不给点击
            }
            flag = true;//能往下执行,表示接下来有动画开始了

            index--;//假设下标为0,要显示最后一张
            if (index < 0) {
                index = imglen - 1;
                //如果当前是第一张图片，需要瞬移到倒数第―张图片(因为第一张和倒数第一图片相同)
                $("ul").css("left", -imglen * width);
                $("ul").animate({//根据下标显示对应图片
                    left: -index * width
                }, 1000, function () {
                    flag = false
                })
            } else {
                $("ul").animate({//根据下标显示对应图片
                    left: -index * width
                }, 1000, function () {
                    flag = false
                })
            }
            dotCHange(index)//切换选中圆点
        })
    </script>
</body>

</html>
avatar
文章
阅读
粉丝