首页 | 简单教程,简单编程

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>
<nav class="navbar navbar-default" role="navigation">
    <div class="container-fluid">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">简单教程</a>
    </div>
    <div>
        
        <ul class="nav navbar-nav navbar-left">
            <li class="dropdown">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                    后端 <b class="caret"></b>
                </a>
                <ul class="dropdown-menu">
                    <li><a href="#">Java</a></li>
                    <li><a href="#">Python</a></li>
                    <li><a href="#">PHP</a></li>
                    <li class="divider"></li>
                    <li><a href="#">分离的链接</a></li>
                    <li class="divider"></li>
                    <li><a href="#">另一个分离的链接</a></li>
                </ul>
            </li>
        </ul>
        <form class="navbar-form navbar-left" role="search">
            <button type="submit" class="btn btn-default">
                向左对齐-提交按钮
            </button>
        </form>
        <p class="navbar-text navbar-left">向左对齐-文本</p>
        
        <ul class="nav navbar-nav navbar-right">
            <li class="dropdown">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                    后端 <b class="caret"></b>
                </a>
                <ul class="dropdown-menu">
                    <li><a href="#">Java</a></li>
                    <li><a href="#">Python</a></li>
                    <li><a href="#">PHP</a></li>
                    <li class="divider"></li>
                    <li><a href="#">分离的链接</a></li>
                    <li class="divider"></li>
                    <li><a href="#">另一个分离的链接</a></li>
                </ul>
            </li>
        </ul>
        <form class="navbar-form navbar-right" role="search">
            <button type="submit" class="btn btn-default">
                向右对齐-提交按钮
            </button>
        </form>
        <p class="navbar-text navbar-right">向右对齐-文本</p>
    </div>
    </div>
</nav>

 
<!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>
<nav class="navbar navbar-default" role="navigation">
    <div class="container-fluid">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">简单教程</a>
    </div>
    <div>
        <!--向左对齐-->
        <ul class="nav navbar-nav navbar-left">
            <li class="dropdown">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                    后端 <b class="caret"></b>
                </a>

代码编辑器：

运行结果：