<!Doctype html>
<html lang="zh-cn">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <!-- Bootstrap CSS -->
<link rel="stylesheet" href="css/bootstrap.css"> <title>Admin后台示例</title>
</head>
<body> <nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
<a href="#" class="navbar-brand">
<img width="30" height="30" class="d-inline-block align-top" src="https://v4.bootcss.com/assets/brand/bootstrap-solid.svg"
alt="">
管理后台
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"
aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a href="#" class="nav-link">
<span class="glyphicon glyphicon-cog"></span> 网站设置
</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">
<span class="glyphicon glyphicon-lock"></span> 管理员
</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">
<span class="glyphicon glyphicon-list"></span> 栏目设置
</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">
<span class="glyphicon glyphicon-user"></span> 用户管理
</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown"
aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form action="" class="form-inline my-2 my-lg-0">
<input type="search" placeholder="搜索内容" aria-label="Search" class="form-control mr-sm-2">
<button class="btn btn-outline-light my-2 my-sm 0" type="submit">搜索</button>
</form>
<ul class="navbar-nav justify-content-end">
<li class="nav-item">
<a href="#" class="nav-link">
Alexander
</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">
<span class="glyphicon glyphicon-eye-close"></span> 退出
</a>
</li>
</ul>
</div>
</nav> <div class="container" style="margin-top:70px;"> 主内容区域 </div> <footer class="fixed-bottom bg-primary">
<br>
<div class="text-center" style="height:50px;color:white;">
<p class="font-weight-bold">2019</p>
</div>
</footer> <!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"></script>
<script src="https://cdn.bootcss.com/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"></script>
<script src="https://cdn.bootcss.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"></script>
</body>
</html>
Bootstrap4 无法直接使用字体图标glyphicon,参考博客园https://www.cnblogs.com/humi/p/8496152.html，导入字体图标。
源码：https://gitee.com/Alexander360/LearnBootStrap4.git