我建立的网站在桌面浏览器上看起来很不错，但在移动设备上，导航栏并未针对移动设备进行优化。内联的页面列表保持在更大的屏幕上，并且导航切换显示在品牌的右侧。不确定是什么问题，但这是我的代码：
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link href="../Content/bootstrap.css" rel="stylesheet" />
</head>
<nav class="navbar navbar-default" id="navbar" role="navigation">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/Home.aspx">
<img src="" class="img-responsive" alt="logo" />
</a>
</div>
<div class="collapse navbar-collapse" id="navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="../Home.aspx">Home</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Products & Services <b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="">Workflow</a></li>
<li><a tabindex="-1" href="">Sys</a></li>
<li></li>
<li class="dropdown-submenu"><a tabindex="-1" href="#">App</a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="">Overview</a></li>
<li><a tabindex="-1" href="">Pricing</a></li>
<li><a tabindex="-1" href="">Demo</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="">Contact</a></li>
</ul>
</div>
</nav>
如果有人能为我发光，我会很感激。