jq 轮播图 - 掘金

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

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
    * {
        margin: 0;
        padding: 0;
        list-style: none;
    }

    .container {
        width: 700px;
        position: relative;
        margin: 100px auto;
        align-items: center;
        display: flex;
        justify-content: center;
    }

    .container img {
        width: 700px;
    }

    .imgs li {
        display: none;
    }

    .imgs li:first-child {
        display: block;
    }

    .indexes {
        position: absolute;
        bottom: 10px;
        display: flex;
        height: 20px;
    }

    .indexes li {
        width: 15px;
        height: 15px;
        background: #fff;
        margin: 0 10px;
    }

    .indexes li.active {
        background: red;
    }

    .arrow {
        height: 50px;
        width: 30px;
        position: absolute;
        background: #000;
    }

    .arrow.arrowleft {
        left: -50px
    }

    .arrow.arrowright {
        right: -50px
    }
</style>
</head>

<body>
 <div class="container">
    <div class="arrow arrowleft"></div>
    <div class="arrow arrowright"></div>

    <ul class="imgs">
        <li>
            <img src="http://p1.music.126.net/UbZ8uE01SIY-Jmo8c3fGEQ==/109951165097027317.jpg?imageView&quality=89">
        </li>
        <li>
            <img src="http://p1.music.126.net/U4aWX25bkqj1A4bKHaeNAQ==/109951165097467733.jpg?imageView&quality=89">
        </li>
        <li>
            <img src="http://p1.music.126.net/WDK1Xf03KHiwLEi_PWvgoQ==/109951165097312543.jpg?imageView&quality=89">
        </li>
        <li>
            <img src="http://p1.music.126.net/w9_4EDtBaLAsg8E3k11Rkw==/109951165097376119.jpg?imageView&quality=89">
        </li>
    </ul>
    <div class="indexes">
        <li class="active"></li>
        <li></li>
        <li></li>
        <li></li>
    </div>
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
    $(function () {
        let i = 0

        let timer = null

        function run() {
            timer = setInterval(() => {
                if (++i === 4) i = 0
                $('.imgs li').eq(i).show().siblings().hide()
                $('.indexes li').eq(i).addClass('active').siblings('.active').removeClass('active')
            }, 2000);
        }

        run()

        $('.arrowright').click(function () {
            clearInterval(timer)
            if (++i > 3) i = 0
            $('.imgs li').eq(i).show().siblings().hide()
            $('.indexes li').eq(i).addClass('active').siblings('.active').removeClass('active')
            run()
        })

        $('.arrowleft').click(function () {
            clearInterval(timer)
            if (--i < 0) i = 3
            $('.imgs li').eq(i).show().siblings().hide()
            $('.indexes li').eq(i).addClass('active').siblings('.active').removeClass('active')
            run()
        })

        $('.indexes li').click(function () {
            clearInterval(timer)
            i = $(this).index()
            $('.imgs li').eq(i).show().siblings().hide()
            $('.indexes li').eq(i).addClass('active').siblings('.active').removeClass('active')
            run()
        })

    })
</script>
</body>

</html>