上下轮播

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{margin: 0;padding: 0}
        .box{
            width: 100px;
            height: 100px;
            margin: 0 auto;
            overflow: hidden;
        }
        ul{
            list-style: none;
            width: 100px;
            height: 500px;
            position: relative;
            top: -100px;
        }
        .backimg1{
            width: 100px;
            height: 100px;
            background: red;
            position: relative;
            top: 0;
            transition: 1s;
        }
        .backimg2{
            width: 100px;
            height: 100px;
            background: blue;
            position: relative;
            top: 0;
            transition: 1s;
        }
        .backimg3{
            width: 100px;
            height: 100px;
            background: yellow;
            position: relative;
            top: 0;
            transition: 1s;
        }
        .backimg4{
            width: 100px;
            height: 100px;
            background: pink;
            position: relative;
            top: 0;
            transition: 1s;
        }

        .box li{
            text-align: center;
            line-height: 100px;
        }
        .btn{
            width: 100px;
            height: 30px;
            margin: 100px auto;
            display: flex;
            justify-content: space-around;
        }
    </style>
</head>
<body>
<div class="btn">
    <input type="button" value="last">
    <input type="button" value="next">
</div>
<div class="box">
    <ul>
        <li class="backimg4">4</li>
        <li class="backimg1">1</li>
        <li class="backimg2">2</li>
        <li class="backimg3">3</li>

    </ul>
</div>

<script>
    var oinput=document.getElementsByTagName("input");
    var oli=document.getElementsByTagName("li");
    var ul=document.getElementsByTagName("ul")[0];

    oinput[0].onclick=function () {
        ul.style.transition=1+"s";
        ul.style.top=0+"px";
        oinput[0].disabled=true;
        oinput[1].disabled=true;
        setTimeout(function ()
        {
            ul.insertBefore(oli[3],oli[0]);
            oinput[0].disabled=false;
            oinput[1].disabled=false;
            ul.style.transition=0+"s";
            ul.style.top=-100+"px";
        },1000)
    };
    oinput[1].onclick=function () {
        ul.style.transition=1+"s";
        ul.style.top=-200+"px";
        oinput[0].disabled=true;
        oinput[1].disabled=true;
        setTimeout(function ()
        {
            ul.appendChild(oli[0]);
            oinput[0].disabled=false;
            oinput[1].disabled=false;
            ul.style.transition=0+"s";
            ul.style.top=-100+"px";
        },1000)

    }
</script>
</body>
</html>
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