twitter-bootstrap 基本导航栏（固定在页面顶部）
示例
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<!--- vvv Hamburger icon that gets shown when window reaches a certain scale vvv --->
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<!--- ^^^ Hamburger icon that gets shown when window reaches a certain scale ^^^ --->
<a class="navbar-brand" href="#">WebSite Title</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a asp-controller="Home" asp-action="Contact">Contact</a></li>
</ul>
</div>
</div>
</div>
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