JavaScript—原生轮播和无缝滚动

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <style>

        * {

            margin: 0;

            padding: 0;

        }

        ul {

            list-style: none;

        }

        #banber {

            border: #e74c3c 1px solid;

            margin: 100px;

            width: 800px;

            height: 480px;

            position: relative;

            overflow: hidden;

        }

        #banber span:last-child {

            left: 780px;

        }

        #banber span {

            background: #999999;

            font-size: 26px;

            color: #ffffff;

            width: 20px;

            height: 40px;

            opacity: 0.7;

            position: absolute;

            top: 220px;

        }

        #banber ul {

            width: 6000px;

            position: absolute;

        }

        #banber ul li {

            width: 800px;

            height: 480px;

            float: left;

        }

        #list {

            position: absolute;

            background-color: #cccccc;

            left: 580px;

            top: 420px;

            height: 10px;

            opacity: 0.7;

            padding: 2px 50px 2px 0px;

        }

        #list a {

            float: left;

            background-color: #f23d9c;

            border-radius: 50%;

            width: 10px;

            height: 10px;

            margin-left: 8px;

        }

    </style>

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

</head>

<body>

<div id="banber">

    <ul>

        <li><img src="data:images/CJD2.jpg" alt=""></li>

        <li><img src="data:images/CJD1.jpg" alt=""></li>

        <li><img src="data:images/CJD3.jpg" alt=""></li>

        <li><img src="data:images/CJD4.jpg" alt=""></li>

        <li><img src="data:images/CJD5.jpg" alt=""></li>

    </ul>

    <div id="arrol">

        <span><</span>

        <span>> </span>

    </div>

    <div id="list">

    </div>

</div>

<script>

    const banaer = document.getElementById('banber')

    const arrol = document.getElementById('arrol')

    const list = document.getElementById('list')

    let index = 0

    //1,动态生成小圆球

    //获取ul

    const b_ul = banaer.getElementsByTagName('ul')[0];

    //获取LI的长度

    const len = b_ul.getElementsByTagName('li').length

    for (let i = 0; i < len; i++) {

        let a = document.createElement('a')

        list.appendChild(a)

        a.onclick = Click

        //设置标签自定义属性--很重要 添加索引

        a.setAttribute('index', i)

    }

    list.children[0].style.backgroundColor = '#ff8400'

        //点击

    function Click() {

        for (let i = 0; i < list.children.length; i++) {

            let a = list.children[i]

            a.style.backgroundColor = ''

            this.style.backgroundColor = '#ff8400'

            // 获取自定义属性 点的是第几个

            index = parseInt(this.getAttribute('index'))

            //调用动画

            animte(b_ul, (-index) * 800)

        }

    }

    //箭头

    arrol.children[0].onclick = function () {

        if (index == 0) {

            index = len;

            b_ul.style.left = -index * 800 + 'px';

        }

        index--;

        list.children[index].click()

    }

    //无缝滚动

    let firstLi = b_ul.children[0]

    let clone = firstLi.cloneNode(true)

    b_ul.appendChild(clone)

    arrol.children[1].onclick = function () {

        if (index === len) {

            b_ul.style.left = '0px';

            index = 0

        }

        index++;

        if (index < len) {

            list.children[index].click()

        } else {

            animte(b_ul, index * -800)

            for (let i = 0; i < list.children.length; i++) {

                let a = list.children[i]

                a.style.backgroundColor = ''

            }

            list.children[0].style.backgroundColor = '#ff8400'

        }

    }

    // 自动播放

    let time=setInterval(function () {

        arrol.children[1].click()

    },3000)

    banaer.onmouseenter=function () {

        clearInterval(time)

    }

    banaer.onmouseleave=function () {

        time=setInterval(function () {

            arrol.children[1].click()

        },3000)

    }

</script>

</body>

</html>
　　今天写了无缝轮播滚动虽然代码有许许多多的不规范，不过对思维的一个锻炼前面知识的复习，对于初学者也是很不错
巴特西

JavaScript—原生轮播和无缝滚动

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