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Html+CSS+JS轮播图实现源码(手动轮播,自动轮播)

作者:emm_10_01

今天做网站的时候需要用上JS轮播图代码,而且还要求是原生的JS代码,下面这篇文章主要给大家介绍了关于Html+CSS+JS轮播图实现的相关资料,文中介绍的方法包括手动轮播和自动轮播,需要的朋友可以参考下

演示效果

轮播图代码:

<!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>
    <style>
        .banner {
            width: 500px;
            height: 300px;
            position: relative;
            /* border: 1px solid red; */
            margin: 100px auto;
        }
        .banner .wrap {
            width: 100%;
        }
        .banner .wrap .item {
            width: 100%;
        }
        .item img {
            width: 500px;
            height: 300px;
            vertical-align: top;
            position: absolute;
        }
        .div1 {
            position: absolute;
            left: 0;
            top: 50%;
            transform: translatey(-50%);
            cursor: pointer;
            width: 41px;
            height: 69px;
            font-size: 30px;
            line-height: 70px;
            text-align: center;
            color: #D6D8D4;
            background-color: rgba(0, 0, 0, 0.3);
        }
        .div2 {
            position: absolute;
            right: 0;
            top: 50%;
            transform: translatey(-50%);
            cursor: pointer;
            width: 41px;
            height: 69px;
            font-size: 30px;
            line-height: 70px;
            text-align: center;
            color: #D6D8D4;
            background-color: rgba(0, 0, 0, 0.3);
        }
        .pagenation {
            position: absolute;
            /* border: 1px solid red; */
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            bottom: 40px;
        }
        .pagenation>div {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: white;
            margin-right: 10px;
            cursor: pointer;
        }
        .pagenation>div:last-child {
            margin-right: 0;
        }
    </style>
</head>
<body>
    <div class="banner">
        <div class="warp">
            <div class="item"><img src="./img/1.jpg" alt=""></div>
            <div class="item"><img src="./img/2.jpg" alt=""></div>
            <div class="item"><img src="./img/3.jpg" alt=""></div>
            <div class="item"><img src="./img/4.jpg" alt=""></div>
        </div>
        <div class="div1">
            <</div> <div class="div2 ">>
        </div>
        <!-- 小圆点 -->
        <div class="pagenation">
            <div id="pagenation-item0"></div>
            <div id="pagenation-item1"></div>
            <div id="pagenation-item2"></div>
            <div id="pagenation-item3"></div>
        </div>
    </div>
    <script>
        var index = 0; //定义初始下标
        var banner = document.getElementsByClassName("banner")[0];
        var itemList = document.getElementsByClassName("item");
        var pagenationList = document.querySelectorAll(".pagenation>div");
        var pagenation = document.querySelector(".pagenation");
        itemList[0].style.opacity = 1;
        pagenationList[0].style.background = "blue" //初始第一张图对应的小圆点的颜色为蓝色
        var up = document.getElementsByClassName("div1")[0];
        var next = document.getElementsByClassName("div2")[0];
        //下一张图片(封装方便下面自动播放定时器调用)
        function nextFn() {
            index = index >= itemList.length - 1 ? 0 : ++index; //判断点击到了最后一张图片再次点击返回到第一张图
            for (var i = 0; i < itemList.length; i++) {
                itemList[i].style.opacity = 0; //图片透明度为0图片隐藏
                pagenationList[i].style.background = "white " //图片没显现小圆点的颜色为白色
            }
            itemList[index].style.transition = "opacity 1s ease .2s"
            itemList[index].style.opacity = 1; //图片透明度为1图片显现
            pagenationList[index].style.background = "blue" //图片显现小圆点的颜色为蓝色
        }
        next.onclick = nextFn; //下一张(点击事件)点击切换下一张图片
        up.onclick = function () { //上一张(点击事件)点击切换上一张图片
            index = index <= 0 ? itemList.length - 1 : --index; //判断点击到了第一张图片再次点击返回到最后一张图
            for (var i = 0; i < itemList.length; i++) {
                itemList[i].style.opacity = 0;
                pagenationList[i].style.background = "white"
            }
            itemList[index].style.transition = "opacity 1s ease .2s" //增加过渡效果
            itemList[index].style.opacity = 1;
            pagenationList[index].style.background = "blue"
        }
        //设置定时器,自动向下播放图片
        var t1 = setInterval(nextFn, 2000) 
        banner.onmouseover = function () {
            clearInterval(t1);
        }
        banner.onmouseout = function () {
            t1 = setInterval(nextFn, 2000)
        }
        // 事件委托
        pagenation.onclick = function (event) {
            event = window.event || event
            console.log(event);
            if (event.target.className == "pagenation") {
                console.log("点击的是父元素");
            } else {
                var id = event.target.id;
                var photoIndex = null;
                for (var i = 0; i < pagenationList.length; i++) {
                    pagenationList[i].style.background = "white"
                    if (id.indexOf(i) >= 0) {
                        photoIndex = i;
                    }
                }
                event.target.style.background = "blue"
                index = photoIndex; // 将小圆点对应的下标与图片下标对应
                for (var i = 0; i < itemList.length; i++) {
                    itemList[i].style.opacity = 0;
                }
                itemList[index].style.transition = "opacity 1s ease .2s"
                itemList[photoIndex].style.opacity = 1;
            }
        }
    </script>
</body>
</html>

总结

到此这篇关于Html+CSS+JS轮播图实现的文章就介绍到这了,更多相关Html+CSS+JS轮播图内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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