滚动监听

<body data-spy="scroll" data-target="#d" data-offset="50" >

<nav class="navbar navbar-inverse navbar-fixed-top" id="d">
        <div class="container">
           <div class="navbar-header">
            <button class="navbar-toggle collapsed" data-toggle="collapse" data-target="#links">
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                <tton>
            <img src="img/logoMsg.png" class="img-responsive" width="100px" height="100px"/>
           </div>
           <div class="collapse navbar-collapse" id="links">
            <ul class="nav navbar-nav">
            <li><a href="#dl1">买票</a><>
            <li><a href="#dl2">购车</a><>
            <li class="dropdown">
            <a data-toggle="dropdown" class="dropdown-toggle">支付方式</a>
            <ul class="dropdown-menu">
            <li><a href="">QQ支付</a><>
            <li><a href="">微信支付</a><>
            <li><a href="">支付宝支付</a><a class="badge">NEW VOID</a><>
            </ul>
            <>
            </ul>
            <div class="navbar-form navbar-left">
            <div class="form-group">
            <div class="input-group">
            <input type="text" class="form-control" />
            <div class="input-group-btn">
            <button class="btn btn-default">
            <i class="fa fa-search"></i>
            <tton>
            </div>
            </div>
            </div>
           </div>
           <div class="navbar-form navbar-right">
            <div class="form-group">
                        <button class="btn btn-primary btn-sm" data-target="#Logon" data-toggle="modal">登录<tton>
                    </div>
                    <div class="form-group">
                        <button class="btn btn-danger btn-sm">注册<tton>
                    </div>
           </div>
           </div>
        </div>
    </nav>

在想要响应的地方添加ID 就是li标签中的href
然后
<script>
     $(()=>{
     $('body').scrollspy({ target: '#d' });
     })
    </script>