利用原生js实现轮播图效果

最新推荐文章于 2021-09-14 19:55:41 发布

原创最新推荐文章于 2021-09-14 19:55:41 发布 · 651 阅读

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文章标签：

#javascript #动画 #轮播图

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本文介绍如何使用纯JavaScript和HTML/CSS实现一个简单的轮播图效果，并通过定时器动画进行图片切换，同时具备手动控制按钮和指示器。

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这里需要用到定时器动画来实现, animate.js代码见定时器动画一文;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>js原生轮播图</title>
    <style type="text/css">
        * {
            padding: 0;
            margin: 0;
            list-style: none;
            border: 0;
        }

        .all {
            width: 500px;
            height: 200px;
            padding: 7px;
            border: 1px solid #ccc;
            margin: 100px auto;
            position: relative;
        }

        .screen {
            width: 500px;
            height: 200px;
            /*overflow: hidden;*/
            position: relative;
        }

        .screen li {
            width: 500px;
            height: 200px;
            overflow: hidden;
            float: left;
        }

        .screen ul {
            position: absolute;
            left: 0;
            top: 0px;
            width: 3000px;
        }

        .all ol {
            position: absolute;
            right: 10px;
            bottom: 10px;
            line-height: 20px;
            text-align: center;
        }

        .all ol li {
            float: left;
            width: 20px;
            height: 20px;
            background: #fff;
            border: 1px solid #ccc;
            margin-left: 10px;
            cursor: pointer;
        }

        .all ol li.current {
            background: yellow;
        }

        #arr {
            display: none;
        }

        #arr span {
            width: 40px;
            height: 40px;
            position: absolute;
            left: 5px;
            top: 50%;
            margin-top: -20px;
            background: #000;
            cursor: pointer;
            line-height: 40px;
            text-align: center;
            font-weight: bold;
            font-family: '黑体';
            font-size: 30px;
            color: #fff;
            opacity: 0.3;
            border: 1px solid #fff;
        }

        #arr #right {
            right: 5px;
            left: auto;
        }
    </style>
</head>
<body>

<div class="all" id='box'>
    <div class="screen">
        <ul>
            <li><img src="images/1.jpg" width="500" height="200"/></li>
            <li><img src="images/2.jpg" width="500" height="200"/></li>
            <li><img src="images/3.jpg" width="500" height="200"/></li>
            <li><img src="images/4.jpg" width="500" height="200"/></li>
            <li><img src="images/5.jpg" width="500" height="200"/></li>
        </ul>
        <ol>
        </ol>
    </div>
    <div id="arr"><span id="left">&lt;</span><span id="right">&gt;</span></div>
</div>


<script src="../animate.js"></script>
<script>

    //    获取对象
    var box = document.querySelector('#box');
    var screen = box.children[0];
    var arr = document.querySelector('#arr');
    var arrLeft = document.querySelector('#left');
    var arrRight = document.querySelector('#right');
    var ul = screen.children[0];
    var ulLis = ul.children;
    var ol = screen.children[1];
    var imgWidth = screen.offsetWidth;

    //    动态生成小方块
    for (var i = 0; i < ulLis.length; i++) {
        var li = document.createElement('li');
        li.innerHTML = i + 1;
        ol.appendChild(li);
    }

    //        添加假图片
    var cloneLi = ulLis[0].cloneNode(true);
    ul.appendChild(cloneLi);

    var olLis = ol.children;
    olLis[0].className = 'current';

    //    鼠标经过显示箭头
    box.addEventListener('mouseover', function () {
        arr.style.display = 'block';
    });
    //    鼠标离开隐藏箭头
    box.addEventListener('mouseout', function () {
        arr.style.display = 'none';
    });

    //    点击小方块切换轮播图
    for (var i = 0; i < olLis.length; i++) {
        olLis[i].index = i;
        olLis[i].addEventListener('click', function () {
//            排它
            for (var i = 0; i < olLis.length; i++) {
                olLis[i].className = "";
            }
            this.className = 'current';

//            让轮播图跟随小方块
            var target = -this.index * imgWidth;
            animate(ul, target);
        });
    }

    //    记录当前图片
    var pic = 0;
    //    记录当前小方块
    var square = 0;

    //    点击左箭头
    arrLeft.addEventListener('click', function () {

        if (pic === ulLis.length - 1) {
            pic = 0;
            ul.style.left = '0px';
        }

        pic++;
        var target = -pic * imgWidth;
        animate(ul, target);

        square--;
        if (square == -1) {
            square = olLis.length - 1;
        }
        for (var i = 0; i < olLis.length; i++) {
            olLis[i].className = "";
        }
        olLis[square].className = "current";


    });

//    右箭头点击事件
    arrRight.addEventListener('click', function () {
        if (pic === 0) {
            pic = ulLis.length - 1;
            ul.style.left = -pic * imgWidth + 'px';
        }

        pic--;
        var target = -pic * imgWidth;
        animate(ul, target);

        square++;
        if (square === olLis.length) {
            square = 0;
        }

        for (var i = 0; i < olLis.length; i++) {
            olLis[i].className = "";
        }
        olLis[square].className = 'current';

    });

    //    自动播放
    timer = setInterval(function () {
        arrLeft.click();
    }, 3000);


</script>

</body>
</html>