bootstrap导航栏+滚动监听

演示效果：

bootstrap导航栏+滚动监听演示2.gif

先拿一段最简单的bootstrap导航栏

<nav class="navbar navbar-default">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
        <li><a href="#">Link</a></li>
      </ul>
      <form class="navbar-form navbar-left">
        <div class="form-group">
          <input type="text" class="form-control" placeholder="Search">
        </div>
        <button type="submit" class="btn btn-default">Submit</button>
      </form>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#">Link</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Separated link</a></li>
          </ul>
        </li>
      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>

1.将最外层<nav>标签设置
id="navbar-example" class="navbar navbar-default navbar-fixed-top navbar-inverse"
2.在<nav>标签里面任意位置添加

<ul class="nav navbar-nav">
   <li class="active"><a href="#MCreationDiv">物料创建</a></li>
   <li><a href="#McharacteristicDiv">物料特性</a></li>
   <li><a href="#MEditingDiv">物料编辑</a></li>
   <li><a href="#HandDoingDiv">手动输入对照例</a></li>
   <li><a href="#addMDIv">添加物质/物料特性</a></li>
</ul>

重点来了！！ 标签名字是可以随意更改的，但a标签中的href必须指向被监听的那些div元素 ，且被监听对象都有一定的高度
3.JS中添加
$('body').scrollspy({ target: '#navbar-example' })
4.CSS设置body的
positon:"relative"