One of BootStrap's practical code snippets_javascript skills

As in the title, continue to summarize the problems you encounter when using BootStrap and record the solutions. I hope it can help those in need
Application scenario: In the classic top-bottom layout, the top navigation bar is fixed and the lower padding does not display the scroll bar
Solution: The navigation bar is fixed at the top, and the padding-top is set for the body. The padding is the height of the navigation bar (default 50px, you can adjust the height yourself). The html code is as follows:

<!--html页面布局-->
<div class="container-fluid page-wrapper">
  <!--导航栏-->
  <div class="navbar navbar-default navbar-fixed-top" role="navigation">
    <div class="container">
      <!--logo图标-->
      <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#myMenu">
          <span class="sr-only">切换导航条</span> <span class="icon-bar"></span>
          <span class="icon-bar"></span> <span class="icon-bar"></span>
        </button>
        <a class="navbar-brand" href="">
          <img src="/static/imghwm/default1.png"  data-src="images/logo_2.png"  class="lazy" alt="">
        </a>
      </div>
      <!--导航栏菜单-->
      <div class="collapse navbar-collapse" id="myMenu">
        <ul class="nav navbar-nav">
          <li>
            <a href="index.html" >主页</a>
          </li>
          <li>
            <a href="#" data-toggle="modal">河道站点</a>
          </li>
          <li>
            <a href="#" data-toggle="modal">水库站点</a>
          </li>
          <li>
            <a href="#">气象站点</a>
          </li>
          <li>
            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">降雨量<span class="caret"></span>
            </a>
            <ul class="dropdown-menu">
              <li>
                <a data-toggle="modal">1小时降雨</a>
              </li>
              <li>
                <a href="#">3小时降雨</a>
              </li>
              <li>
                <a href="#">24小时降雨</a>
              </li>

            </ul>
          </li>
        </ul>
        <form class="navbar-form navbar-left" role="search">
          <div class="form-group">
            <input type="text" id="datetimepicker" class="form-control" placeholder="选择日期">
          </div>
          <button type="button" class="btn btn-default">确定</button>
        </form>
      </div>
    </div>
  </div>
  <!--地图窗口-->
  <div class="container-fluid" id="map"></div>
</div>

</body>
</html>

CSS code:

*{
margin:0;
padding:0;
border:0;
}
html, body{
height:100%;
width:100%;
overflow:hidden;
}
body{
padding-top:50px;
}
.page-wrapper{
margin:0;
padding:0;
height:100%;
overflow:hidden;
}
#map{
width:100%;
height:100%;
}

Realization effect:

I hope this article will be helpful to everyone learning Bootstrap.