易百教程

<nav class = "navbar navbar-default" role = "navigation">

   <div class = "navbar-header">
      <button type = "button" class = "navbar-toggle" 
         data-toggle = "collapse" data-target = "#example-navbar-collapse">
         <span class = "sr-only">Toggle navigation</span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
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      <a class = "navbar-brand" href = "#">yiibai</a>
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   <div class = "collapse navbar-collapse" id = "example-navbar-collapse">

      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
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         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
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            <ul class = "dropdown-menu">
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               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>

               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
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