li无缝滚动

<style>
            * {
                margin: 0px;
                padding: 0px;
            }

            .wrapp {
                height: 400px;
                border: 1px solid red;
                width: 200px;
                overflow: hidden;
                margin: 200px auto;
                text-align: center;
            }

            li {
                list-style: none;
                color: black;
                font-size: 26px;
                margin-bottom: 10px;
            }
        </style>

<body>
        <div class='wrapp'>
            <div class='list'>
                <ul>
                    <li>数据一</li>
                    <li>数据二</li>
                    <li>数据三</li>
                    <li>数据四</li>
                    <li>数据五</li>
                    <li>数据六</li>
                    <li>数据七</li>
                    <li>数据八</li>
                    <li>数据九</li>
                    <li>数据十</li>
                </ul>
            </div>
            <div class='listClone'></div>
        </div>
    </body>

<script src='js/jquery-1.8.3.min.js'></script>
    <script>
        var wrapp=document.getElementsByClassName('wrapp')[0];
        var list=document.getElementsByClassName('list')[0];
        var listClone=document.getElementsByClassName('listClone')[0];
        listClone.innerHTML=list.innerHTML;
        var time=6;
        var listRoolGo=setInterval(listRool,time)
        function listRool() {
            if (listClone.offsetHeight-wrapp.scrollTop<=0) {
                wrapp.scrollTop-=list.offsetHeight;
            } else {
                wrapp.scrollTop++
            }
        }
    </script>

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