案例：jQuery UI案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!doctype html>
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<html lang="en">
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<head>
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  <meta charset="utf-8">
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  <title>jQuery UI 拖动（Draggable） - 约束运动</title>
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  <link rel="stylesheet" href="/css/jqu1.10.4/jquery-ui.min.css">
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  <script src="/js/jqu/jquery.min1.10.2.js"></script>
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  <script src="/js/jqu/jquery-ui.min1.10.4.js"></script>
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  <link rel="stylesheet" href="jqueryui/style.css">
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  <style>
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  .draggable { width: 90px; height: 90px; padding: 0.5em; float: left; margin: 0 10px 10px 0; }
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  #draggable, #draggable2 { margin-bottom:20px; }
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  #draggable { cursor: n-resize; }
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  #draggable2 { cursor: e-resize; }
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  #containment-wrapper { width: 95%; height:150px; border:2px solid #ccc; padding: 10px; }
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  h3 { clear: left; }
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  </style>
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  <script>
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  $(function() {
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    $( "#draggable" ).draggable({ axis: "y" });
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    $( "#draggable2" ).draggable({ axis: "x" });
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    $( "#draggable3" ).draggable({ containment: "#containment-wrapper", scroll: false });
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    $( "#draggable5" ).draggable({ containment: "parent" });
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  });
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  </script>
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</head>
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<body>
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<h3>沿着轴约束运动：</h3>
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<div id="draggable" class="draggable ui-widget-content">
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  <p>只能垂直拖拽</p>
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</div>
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<div id="draggable2" class="draggable ui-widget-content">
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  <p>只能水平拖拽</p>
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</div>
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<h3>或者在另一个 DOM 元素中约束运动：</h3>
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<div id="containment-wrapper">
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  <div id="draggable3" class="draggable ui-widget-content">
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    <p>我被约束在盒子里</p>
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  </div>
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  <div class="draggable ui-widget-content">
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    <p id="draggable5" class="ui-widget-header">我被约束在父元素内</p>
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  </div>