代码编辑器：
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<meta name="viewport" content="width=device-width, initial-scale=1">4
<link rel="stylesheet" href="https://cdn.bootcss.com/foundation/5.5.3/css/foundation.min.css">5
<script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>6
<script src="https://cdn.bootcss.com/foundation/5.5.3/js/foundation.min.js"></script>7
<script src="https://cdn.bootcss.com/foundation/5.5.3/js/vendor/modernizr.js"></script>8
<body style="height:1500px;padding:20px;">9
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<h3>Magellan Options</h3>11
<h5 class="subheader"> <code>threshold</code> 选项指定导航在什么时候需要固定位置。会根据滚动条滚动计算，默认为 0 (auto)。该实例中我们设置为 100</h5>12
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<div data-magellan-expedition="fixed" data-options="threshold:100">15
<dl class="sub-nav">16
<dd data-magellan-arrival="page1"><a href="#page1">Page 1</a></dd>17
<dd data-magellan-arrival="page2"><a href="#page2">Page 2</a></dd>18
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