导航条

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<nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" 
            data-target="#navbar" aria-expanded="false" aria-controls="navbar">
               <span class="sr-only">Toggle navigation</span>
               <span class="icon-bar"></span>
               <span class="icon-bar"></span>
               <span class="icon-bar"></span>
               <!-- <span class="icon-bar"></span> -->
     			 </button>
           <a class="navbar-brand" href="#">Bootstrap theme</a>
        </div>
        <div id="navbar" class="navbar-collapse collapse">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">Home</a></li>
                <li><a href="#">About</a></li>
                <li><a href="#">Contact</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 class="dropdown-header">Nav header</li>
                        <li><a href="#">Separated link</a></li>
                        <li><a href="#">One more separated link</a></li>
                    </ul>
                </li>
            </ul>
        </div>
    </div>
</nav>

这是bootstrap主题导航条，是响应式布局。当在手机上展现如下图所示

这是一个可点击的小按钮，组成元素如下。在使用Bootstrap组件需要添加bootstrap.js && Jquery.js

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<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" 
 data-target="#navbar" aria-expanded="false" aria-controls="navbar">
    <span class="sr-only">Toggle navigation</span>
    <span class="icon-bar"></span> <!--图标是一条横线-->
    <span class="icon-bar"></span>
    <span class="icon-bar"></span>
</button>

data-target="#navbar" 指向需要展出的导航

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<!--添加id="navbar"-->
<div id="navbar" class="navbar-collapse collapse">
    <ul class="nav navbar-nav">…………