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我正在使用 Jquery UI 的可排序插件并使用它附带的名为“connect-lists.html”的示例。我想通过使用display:none（不是visibility:hidden!!）隐藏第一个 ul，但让li被拖动的内容显示在屏幕上。这是演示的代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>jQuery UI Sortable - Connect lists</title>
    <link rel="stylesheet" href="../../themes/base/jquery.ui.all.css">
    <script src="../../jquery-1.7.2.js"></script>
    <script src="../../ui/jquery.ui.core.js"></script>
    <script src="../../ui/jquery.ui.widget.js"></script>
    <script src="../../ui/jquery.ui.mouse.js"></script>
    <script src="../../ui/jquery.ui.sortable.js"></script>
    <link rel="stylesheet" href="../demos.css">
    <style>
    #sortable1, #sortable2 
    { 
         list-style-type: none;  
         margin: 0;  
         padding: 0 0 2.5em;  
         float: left;  
         margin-right: 10px;  
    }
    #sortable1 li, #sortable2 li 
    { 
         margin: 0 5px 5px 5px;  
         padding: 5px;  
         font-size: 1.2em;  
         width: 120px;  
         overflow:visible;display:block;  
    }
    </style>
    <script>
    $(function() {
        $( "#sortable1, #sortable2" ).sortable({
            start: function(event, ui){
                $('#sortable1').hide();
                //is it possible to show the ui.item???
            },
            connectWith: ".connectedSortable"
        }).disableSelection();
    });
    </script>
</head>
<body>
<div class="demo">

<ul id="sortable1" class="connectedSortable">
    <li class="ui-state-default">Item 1</li>
    <li class="ui-state-default">Item 2</li>
    <li class="ui-state-default">Item 3</li>
    <li class="ui-state-default">Item 4</li>
    <li class="ui-state-default">Item 5</li>
</ul>

<ul id="sortable2" class="connectedSortable">
    <li class="ui-state-highlight">Item 1</li>
    <li class="ui-state-highlight">Item 2</li>
    <li class="ui-state-highlight">Item 3</li>
    <li class="ui-state-highlight">Item 4</li>
    <li class="ui-state-highlight">Item 5</li>
</ul>

</div><!-- End demo -->



<div class="demo-description">
<p>
    Sort items from one list into another and vice versa, by passing a selector
    into the <code>connectWith</code> option. The simplest way to do this is to
    group all related lists with a CSS class, and then pass that class into the
    sortable function (i.e., <code>connectWith: '.myclass'</code>).
</p>
</div><!-- End demo-description -->

</body>
</html>

我刚刚添加了一个开始事件，并将其隐藏在ul那里。这里的问题是当我开始将项目从第一个列表拖到第二个时，ul 和 li 都消失了。我该如何解决这个问题？

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