rc="js/jquery.extend.js" type="text/javascript"></script>
    <!--主要写的css代码-->
    <link href="css/default.css" rel="stylesheet" type="text/css" />
    <!--主要写的js代码-->
    <script src="js/default.js" type="text/javascript"></script>
</head>
<body>
    <nav class="navbar navbar-inverse navbar-fixed-top">
        <div class="container-fluid">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle show pull-left" data-target="sidebar">
       