当我访问该网站的移动版本时，＆＃34;系统＆＃34;下拉菜单在进入systems.html之前闪烁。我希望用户在点击＆＃34;系统＆＃34;时可以看到下拉菜单。链接和访问systems.html页面的另一种方式。
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<meta name="description" content="">
<meta name="author" content="">
<title>Health Water Systems - Premium Hydration For Your Health</title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="css/style.css" rel="stylesheet">
<link href="font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">
<link href="http://fonts.googleapis.com/css?family=Lora:400,700,400italic,700italic" rel="stylesheet" type="text/css">
<link href="http://fonts.googleapis.com/css?family=Montserrat:400,700" rel="stylesheet" type="text/css">
<!-- Navigation -->
<nav class="navbar navbar-custom navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-main-collapse">
<i class="fa fa-bars"></i>
</button>
<a class="navbar-brand page-scroll" href="index.html">
<img src="img/logo.jpg" width="150">
</a>
</div>
<div class="collapse navbar-collapse navbar-right navbar-main-collapse">
<ul class="nav navbar-nav">
<a href="index.html"></a>
<li class="hidden">
</li>
<li>
<a href="systems.html">Systems</a>
<ul class="sub-menu">
<li><a href="brochures/ION-100.pdf" target="_blank">Ion-100</a></li>
<li><a href="brochures/ION-400-dual.pdf" target="_blank">Ion-400</a></li>
<li><a href="brochures/M600-BVA-dual.pdf" target="_blank">M600-BVA</a></li>
</ul>
</li>
<li>
<a href="whyalkalineh2o.html">Why Alkaline H20</a>
</li>
<li>
<a href="enhancedhydration.html">Enhanced Hydration</a>
</li>
<li>
<a href="environmental.html">Environmental</a>
</li>
<li>
<a href="contact.html">Contact</a>
</li>
</ul>
</div>
</div>
</nav>
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<header class="intro">
<div class="intro-body">
<div class="container">
<div class="row">
<div class="col-md-12 col-md-offset-0 homelogo">
<p align="left"><img src="img/logo.jpg" class="img-responsive" width="600"></p>
<p align="text-center" style="color:black;"><i>ALKALINE WATER AT YOUR FINGERTIPS ®</i></p>
</div>
<div class="col-md-12 col-md-offset-0 homewater">
<img src="img/watersplash.jpg" class="img-responsive" width="450">
</div>
<div class="col-md-12 col-md-offset-0">
<ul class="photo-button">
<li>
<a href="systems.html">
<figure>
<img src="img/purifiedalkalinewater.jpg" class="img-responive">
<figcaption><p>Purified Alkaline Water</p></figcaption>
</figure>
</a>
</li>
<li>
<a href="environmental.html">
<figure>
<img src="img/environmentalfriendly.jpg">
<figcaption><p>Environmental Friendly</p></figcaption>
</figure>
</a>
</li>
<li>
<a href="enhancedhydration.html">
<figure>
<img src="img/superiorhydration.jpg">
<figcaption><p>Superior Hydration</p></figcaption>
</figure>
</a>
</li>
<li>
<a href="whyalkalineh2o.html">
<figure>
<img src="img/alkalinewaterbenefits.jpg" class="img-responive">
<figcaption><p>Alkaline Water Benefits</p></figcaption>
</figure>
</a>
</li>
</ul>
<ul class="mphoto-button" style="padding-top:20px;">
<li>
<a href="systems.html">
<figure>
<img src="img/purifiedalkalinewater.jpg" class="img-responive">
<figcaption><p>Purified Alkaline Water</p></figcaption>
</figure>
</a>
</li>
<li>
<a href="environmental.html">
<figure>
<img src="img/environmentalfriendly.jpg">
<figcaption><p>Environmental Friendly</p></figcaption>
</figure>
</a>
</li>
<li>
<a href="enhancedhydration.html">
<figure>
<img src="img/superiorhydration.jpg">
<figcaption><p>Superior Hydration</p></figcaption>
</figure>
</a>
</li>
<li>
<a href="whyalkalineh2o.html">
<figure>
<img src="img/alkalinewaterbenefits.jpg" class="img-responive">
<figcaption><p>Alkaline Water Benefits</p></figcaption>
</figure>
</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</header>
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<p>Copyright © 2015 Health Water Systems LLC.</p>
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<script src="js/contact_me.js"></script>
答案 0 :(得分：0)
要创建下拉菜单，您必须将班级dropdown添加到sub-menu
这是一个示例代码
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Systems<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="brochures/ION-100.pdf" target="_blank">Ion-100</a></li>
<li><a href="brochures/ION-400-dual.pdf" target="_blank">Ion-400</a></li>
<li><a href="brochures/M600-BVA-dual.pdf" target="_blank">M600-BVA</a></li>
</ul>
</li>