Bootstrap3-导航条[通俗易懂]

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1. 定义导航条

<!-- 导航条 navbar -->
<div class="navbar nav-bar-default">
  <ul class="nav nav-pills">
  	<li class="active"><a href="#">首页</a></li>
  	<li><a href="#">登录</a></li>
  	<li><a href="#">退出</a></li>
  </ul>
</div>

添加网站表示名(navbar-brand)

<div class="navbar nav-bar-default">
  <a href="#" class="navbar-brand">伊人考试系统</a>
  <ul class="nav nav-pills">
  	<li class="active"><a href="#">首页</a></li>
  	<li><a href="#">登录</a></li>
  	<li><a href="#">退出</a></li>
  </ul>
</div>

导航条包括链接、下拉菜单、网站标题和折叠按钮

<nav class="navbar navbar-default" role="navigation">
    <div class="navbar-header">
     <button class="navbar-toggle" type="button" data-toggle="collapse" data-target="#menu">
          <span class="sr-only">展开导航</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
       </button>
       <a href="#" class="navbar-brand">网站标题</a>
    </div>
   <div class="collapse navbar-collapse" id="menu">
      <ul class="nav navbar-nav">
         <li><a href="#">首页</a></li>
         <li><a href="#">导航标题1</a></li>
         <li><a href="#">导航标题2</a></li>
         <li class="dropdown">
           <a href="#" class="dropdown-toggle" data-toggle="dropdown">
              下拉菜单<b class="caret"></b>
           </a>
           <ul class="dropdown-menu">
              <li><a href="#">下拉菜单1</a></li>
              <li class="divider"></li>
              <li><a href="#">下拉菜单2</a></li>
              <li class="divider"></li>
           </ul>
        </li>
      </ul>
   </div>
 </nav>

2. 绑定对象

包裹菜单

<!-- 导航条 包裹表单 -->
 <nav class="navbar navbar-default" role="navigation">
       <a href="#" class="navbar-brand">网站标题</a>
   <form action="" class="navbar-form navbar-left" role="search">
      <div class="form-group"><input type="text" class="form-control" placeholder="关键字"></div>
      <button class="btn btn-default" type="submit">提交</button>
   </form>
 </nav>

包裹下拉菜单

 <!-- 导航条 包裹下拉菜单 -->
 <div class="navbar navbar-default">
    <ul class="nav navbar-nav">
       <li class="dropdown">
           <a href="#" data-toggle="dropdown">分享 <b class="caret"></b></a>
           <ul class="dropdown-menu">
              <li><a href="#">QQ</a></li>
              <li><a href="#">微信</a></li>
              <li><a href="#">微博</a></li>
           </ul>
       </li>
    </ul>
 </div>

包裹按钮(navbar-btn类)

<div class="navbar navbar-default">
    <button class="btn btn-default navbar-btn" type="button">按钮1</button>
    <button class="btn btn-primary navbar-btn" type="button">按钮2</button>
    <button class="btn btn-default navbar-btn" type="button">按钮3</button>
 </div>

包裹文本(navbar-text)和链接(navbar-link)

<div class="navbar navbar-default">
     <button class="btn btn-default navbar-btn" type="button">按钮</button>
    <p class="navbar-text">欢迎登录！</p>
    <p class="navbar-text">
        普通段落<a href="#" class="navbar-link">链接</a></p>
 </div>

3. 设计导航条

置顶导航条(.navbar-fixed-top .navbar-static-top)
navbar-fixed-top和navbar-static-top的区别:
fixed会吸附在顶部，static在页面下拉滚动式会消失

<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap 导航条</title>
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <!-- 引入 Bootstrap -->
      <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
 
      <!-- HTML5 Shiv 和 Respond.js 用于让 IE8 支持 HTML5元素和媒体查询 -->
      <!-- 注意： 如果通过 file://  引入 Respond.js 文件，则该文件无法起效果 -->
      <!--[if lt IE 9]>
         <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
         <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
      <![endif]-->
      <style>
         body{
            padding-top: 50px;
         }
      </style>
   </head>
   <body>
      <!-- 导航条 包裹文本 -->
     <div class="navbar navbar-default navbar-fixed-top">
        <a href="#" class="navbar-brand">置顶导航条</a>
        <form action="#" class="navbar-form navbar-left" role="search">
           <div class="form-group"><input type="text" class="form-control" placeholder="关键字"></div>
           <button class="btn btn-default" type="submit">搜索</button>
        </form>
     </div>
     <div style="height:2000px;border: solid 1px red;margin:6px;"><img src="https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1556259084&di=29d728888a58d093701439b1abbf8d3b&src=http://img.pconline.com.cn/images/upload/upc/tx/itbbs/1410/19/c6/39851563_1413703610908.jpg" alt="" class="img-responsive"></div>
      
      <!-- jQuery (Bootstrap 的 JavaScript 插件需要引入 jQuery) -->
      <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
      <!-- 包括所有已编译的插件 -->
      <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
   </body>
</html>

置底导航条(navbar-fixed-bottom)

<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap 导航条</title>
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <!-- 引入 Bootstrap -->
      <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
 
      <!-- HTML5 Shiv 和 Respond.js 用于让 IE8 支持 HTML5元素和媒体查询 -->
      <!-- 注意： 如果通过 file://  引入 Respond.js 文件，则该文件无法起效果 -->
      <!--[if lt IE 9]>
         <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
         <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
      <![endif]-->
      
   </head>
   <body>
      <!-- 导航条 包裹文本 -->
     <div class="navbar navbar-default navbar-fixed-bottom" role="navigation">
        <a href="#" class="navbar-brand">置顶导航条</a>
        <form action="#" class="navbar-form navbar-left" role="search">
           <div class="form-group"><input type="text" class="form-control" placeholder="关键字"></div>
           <button class="btn btn-default" type="submit">搜索</button>
        </form>
     </div>
     <div style="height:2000px;border: solid 1px red;margin:6px;">
      <img src="http://img.pconline.com.cn/images/upload/upc/tx/itbbs/1410/19/c6/39851563_1413703610908.jpg" alt="" class="img-responsive">
   </div>
      
      <!-- jQuery (Bootstrap 的 JavaScript 插件需要引入 jQuery) -->
      <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
      <!-- 包括所有已编译的插件 -->
      <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
   </body>
</html>

设计导航条反色效果

<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap 导航条</title>
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <!-- 引入 Bootstrap -->
      <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
 
      <!-- HTML5 Shiv 和 Respond.js 用于让 IE8 支持 HTML5元素和媒体查询 -->
      <!-- 注意： 如果通过 file://  引入 Respond.js 文件，则该文件无法起效果 -->
      <!--[if lt IE 9]>
         <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
         <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
      <![endif]-->
      <style>
        body{
          padding-top: 50px;
        }
      </style>
   </head>
   <body>
      <!-- 导航条 包裹文本 -->
     <div class="navbar navbar-default navbar-inverse navbar-fixed-top" role="navigation">
        <a href="#" class="navbar-brand">置顶导航条</a>
        <form action="#" class="navbar-form navbar-left" role="search">
           <div class="form-group"><input type="text" class="form-control" placeholder="关键字"></div>
           <button class="btn btn-default" type="submit">搜索</button>
        </form>
     </div>
     <div style="height:2000px;border: solid 1px red;margin:6px;"><img src="https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1556259084&di=29d728888a58d093701439b1abbf8d3b&src=http://img.pconline.com.cn/images/upload/upc/tx/itbbs/1410/19/c6/39851563_1413703610908.jpg" alt="" class="img-responsive"></div>
      
      <!-- jQuery (Bootstrap 的 JavaScript 插件需要引入 jQuery) -->
      <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
      <!-- 包括所有已编译的插件 -->
      <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
   </body>
</html>

设计响应式导航条

<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap 导航条</title>
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <!-- 引入 Bootstrap -->
      <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
 
      <!-- HTML5 Shiv 和 Respond.js 用于让 IE8 支持 HTML5元素和媒体查询 -->
      <!-- 注意： 如果通过 file://  引入 Respond.js 文件，则该文件无法起效果 -->
      <!--[if lt IE 9]>
         <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
         <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
      <![endif]-->
   </head>
   <body>
      <!-- 导航条 包裹文本 -->
     <div class="navbar navbar-default navbar-static-top" role="navigation">
        <button class="navbar-toggle" type="button" data-toggle="collapse" data-target="#a">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        <ul class="nav navbar-nav collapse navbar-collapse" id="a">
          <li class="active"><a href="#">首页</a></li>
          <li><a href="#">微博</a></li>
          <li><a href="#">微信</a></li>
        </ul>
     </div>
     <div style="height:2000px;border: solid 1px red;margin:6px;"><img src="https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1556259084&di=29d728888a58d093701439b1abbf8d3b&src=http://img.pconline.com.cn/images/upload/upc/tx/itbbs/1410/19/c6/39851563_1413703610908.jpg" alt="" class="img-responsive"></div>
      
      <!-- jQuery (Bootstrap 的 JavaScript 插件需要引入 jQuery) -->
      <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
      <!-- 包括所有已编译的插件 -->
      <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
   </body>
</html>

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