我有以下片段。尽管按钮出现在屏幕上,但我无法以较小的分辨率切换数据值。单击切换按钮时未显示任何数据。
<div class="container">
<nav class="navbar navbar-default" role="navigation">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-headerdata-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse navbar-headerdata-collapse">
<ul class="nav navbar-nav navbar-right">
<li class="active"><a href="#">About Us</a></li>
<li><a href="#">Contact Us</a></li>
<form class="navbar-form navbar-right" role="search">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button class="btn btn-default" type="submit"><i class="glyphicon glyphicon-search"></i></button>
</form>
</ul>
</div><!-- /.navbar-collapse -->
</nav>
</div>
有人可以帮助解决问题吗?
谢谢