<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
<title></title>
<link?rel="stylesheet"?>
<style?type="text/css">
????.a{
????????width:?80%;
????????height:?800px;
????????border:?1px?solid?black;
????????margin:?0?auto;
????????margin-top:?70px;
????}
</style>
</head>
<body?data-target?=?"#Nav"?data-offset?=?"0"?data-spy?=?"scroll">
????????
????<div?style="width:?100px;?text-align:?center;?border:?1px?solid??#C0C0C0;"?class="navbar-fixed-top"?id="Nav">
????????<ul?class="nav?nav-pills?nav-stacked?">
????????????<li><a?href="#HTML5">HTML5</a></li>
????????????<li><a?href="#bootstrap">Bootstrap</a></li>
????????????<li><a?href="#JQuery">JQuery</a></li>
????????</ul>
????</div>
????<div?id="HTML5"?class="a"?style="margin-top:?20px;?">
????????HTML5
????</div>
????<div?id="bootstrap"?class="a">
????????bootstrap
????</div>
????<div?id="JQuery"?class="a">
????????JQuery
????</div>
<script?src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script?src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>?
<!--<script?src="http://cdn.bootcss.com/bootstrap/2.3.1/js/bootstrap-modal.js"></script>-->
<script>?
</script>
</body>
</html>
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