淡入淡出轮播图

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>京东商城</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        .slider {
            height: 340px;
            width: 790px;
            margin: 100px auto;
            position: relative;
        }

        .slider li {
            position: absolute;
            display: none;
        }

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

        .arrow {
            display: none;
        }

        .slider:hover .arrow {
            display: block;
        }

        .arrow-left,
        .arrow-right {
            width: 30px;
            height: 60px;
            background-color: rgba(0, 0, 0, 0.1);
            position: absolute;
            top: 50%;
            margin-top: -30px;
            cursor: pointer;
            text-align: center;
            line-height: 60px;
            color: #fff;
            font-weight: 700;
            font-size: 30px;
        }

        .arrow-left:hover,
        .arrow-right:hover {
            background-color: rgba(0, 0, 0, .5);
        }

        .arrow-left {
            left: 0;
        }

        .arrow-right {
            right: 0;
        }
        ol{
            display: block;
            position: relative;
            background: black;
            color: #ffffff;
            width: 20px;
            height: 20px;
            float: left;
            text-align: center;
            line-height: 20px;
            cursor: pointer;
            border-radius: 50px;
            top: 320px;
            left: 300px;
            z-index: 3;
        }
        .red{
            background: red;
        }
    </style>
    <script src="js/jquery-1.12.4.js"></script>
</head>
<body>
<div class="slider">
    <ul>
        <li><a href="#"><img src="images/01.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/02.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/03.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/04.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/05.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/06.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/07.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/08.jpg" alt=""></a></li>
    </ul>
    <ul>
        <ol class="red">1</ol>
        <ol>2</ol>
        <ol>3</ol>
        <ol>4</ol>
        <ol>5</ol>
        <ol>6</ol>
        <ol>7</ol>
        <ol>8</ol>
    </ul>
    <!--箭头-->
    <div class="arrow">
        <span class="arrow-left">&lt;</span>
        <span class="arrow-right">&gt;</span>
    </div>
</div>
</body>
</html>
<script>
    var index = 0;
    $('.arrow-right').click(right)
    $('.arrow-left').click(function () {
        index--;
        (index == -1)?(index = 7):index;
        demo();
    })

    function right() {
            index++;
            (index == 8)?(index = 0):index;
            demo();
    }
    function demo() {
        $('ol').eq(index).addClass('red').siblings().removeClass('red');
        $(".slider li").eq(index).fadeIn().siblings().fadeOut();

    }

    $('ol').click(function () {
        // $(this).addClass('red').siblings().removeClass('red');
        index=$(this).index();
        console.log(index);
        demo();
    })

    var t=setInterval(right,2000);
    $('li').mouseenter(function () {
        clearInterval(t);
    })
    $('li').mouseleave(function () {
        t=setInterval(right,2000);
    })
</script>
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