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代码编辑器：

<!DOCTYPE htm>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
    body {
        position: relative;
    }
    ul.nav-pills {
        top: 20px;
        position: fixed;
    }
    div.col-sm-9 div {
        height: 250px;
        font-size: 28px;
    }

.section {padding: 100px 10px;}
    #section1 {color: #fff; background-color: #1E88E5;}
    #section2 {color: #fff; background-color: #673ab7;}
    #section3 {color: #fff; background-color: #ff9800;}
    #section41 {color: #fff; background-color: #00bcd4;}
    #section42 {color: #fff; background-color: #009688;}

@media screen and (max-width: 810px) {
        #section1, #section2, #section3, #section41, #section42  {
            margin-left: 150px;
        }
    }
</style>
</head>
<body data-spy="scroll" data-target="#myScrollspy" data-offset="20">
<div class="row">
    <nav class="col-sm-2" id="myScrollspy">
        <div class="container-fluid"> 
        <div class="container-fluid"> 
        <ul class="nav nav-pills nav-stacked">
            <li class="active"><a href="#section1">Section 1</a></li>
            <li><a href="#section2">Section 2</a></li>
            <li><a href="#section3">Section 3</a></li>
            <li class="dropdown">
                <a class="dropdown-toggle" data-toggle="dropdown" href="#">Section 4 <span class="caret"></span></a>
                <ul class="dropdown-menu">
                    <li><a href="#section41">Section 4-1</a></li>
                    <li><a href="#section42">Section 4-2</a></li>                     
                </ul>
            </li>
        </ul>
        </div>  
        </div>      
    </nav>
    <div class="col-sm-6">
        <div id="section1" class="section">    
            <h1>Section 1</h1>
            <p>Try to scroll this section and look at the navigation list while scrolling!</p>
        </div>
        <div id="section2" class="section"> 
            <h1>Section 2</h1>
            <p>Try to scroll this section and look at the navigation list while scrolling!</p>
        </div>        
        <div id="section3" class="section">         
            <h1>Section 3</h1>
            <p>Try to scroll this section and look at the navigation list while scrolling!</p>
        </div>
        <div id="section41" class="section">         
            <h1>Section 4-1</h1>
            <p>Try to scroll this section and look at the navigation list while scrolling!</p>
        </div>      
        <div id="section42" class="section">         
            <h1>Section 4-2</h1>
            <p>Try to scroll this section and look at the navigation list while scrolling!</p>
        </div>
    </div>
</div>

代码编辑器：

运行结果：