答案 0 :(得分:2)
Bootstrap Glyphicon + Bootstrap Badge +小型自定义css应该可以解决问题。使用全屏代码段选项查看结果 - 对于响应式布局,您需要添加额外的CSS。
body {
padding-top: 50px;
}
.badge {
font-size: 9px !important;
line-height: 0.9 !important;
padding: 4px 4px !important;
position: absolute;
right: 4px !important;
text-align: center;
top: 9px !important;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</a>
</div>
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#"> <i class="glyphicon glyphicon-envelope"></i> <span class="badge">42</span></a></li>
</ul>
</div><!--/.nav-collapse -->
</div>
</div>
<div class="container">
<div class="text-center">
<h1>Bootstrap starter template</h1>
<p class="lead">Use this document as a way to quickly start any new project.<br> All you get is this text and a mostly barebones HTML document.</p>
</div>
</div><!-- /.container -->
&#13;