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<div id="con">                <div class="roll">                        <ul>                                <li><a href="javascript:;">mming<br />无缝滚动演示<br />001</a></li>                                <li><a href="javascript:;">mming<br />无缝滚动演示<br />002</a></li>                                <li><a href="javascript:;">mming<br />无缝滚动演示<br />003</a></li>                                <li><a href="javascript:;">mming<br />无缝滚动演示<br />004</a></li>                        </ul>                </div>                <span><< 向左</span>                <span>向右 >></span> </div>