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我想用bootstrap开发我的第一个网站，所以我对它很陌生。 我使用反向导航栏，我注意到，当我的浏览器的窗口较小时，导航栏的右侧在下拉菜单中编译不工作。它不会下拉菜单。Bootstrap小窗口导航栏下拉不起作用
这是多么的窗口通常 
这是下拉菜单不上导航栏正常工作。 PS-它的红色边框。 
这里是我的HTML：
body {
margin: 0;
}
.jumbotron{
align-items:center;
display:flex;
background-image:url('https://static.pexels.com/photos/392018/pexels-photo-392018.jpeg');
background-size:cover;
height:450px;
color:white;
height: 50vh;
}
* {
box-sizing: border-box;
}
.columns {
float: left;
width: 33.3%;
padding: 8px;
}
.price {
list-style-type: none;
border: 1px solid #eee;
margin: 0;
padding: 0;
-webkit-transition: 0.3s;
transition: 0.3s;
}
.price:hover {
box-shadow: 0 8px 12px 0 rgba(0,0,0,0.2)
}
.price .header {
background-color: #2D2727;
color: white;
font-size: 25px;
}
.price li {
border-bottom: 1px solid #eee;
padding: 20px;
text-align: center;
}
.price .grey {
background-color: #eee;
font-size: 20px;
}
.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 10px 25px;
text-align: center;
text-decoration: none;
font-size: 18px;
}
@media only screen and (max-width: 600px) {
.columns {
width: 100%;
}
}<!DOCKTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<title>WebHosting</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<link rel="stylesheet" href="main.css" type="text/css">
</head>
<body>
<!--NavBar-->
<div class="row">
<div class="col-lg-8">
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<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="index.html">WebHosting</a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<li><a href="contactos.html">Contactos</a></li>
<li><a href="preços.html">Preços</a></li>
</ul>
</div>
</div>
</nav>
</div>
</div><!--NavBar END-->
<section class="jumbotron">
<div class="container">
<div class="row text-center">
<h1>WebHosting</h1>
<p>Host your WebSite now!!</p>
<p><a class="btn btn-primary btn-lg" href="precos" role="button">Learn more</a></p>
</div>
</div>
</section>
<div class="columns">
<ul class="price">
<li class="header">Host</li>
<li class="grey">Free</li>
<li>Sem criação de WebSite</li>
<li>Sem Dominio</li>
<li class="grey"><a class="btn btn-primary btn-lg" href="precos" role="button">Buy Now</a></li>
</ul>
</div>
<div class="columns">
<ul class="price">
<li class="header">Host + WebSite</li>
<li class="grey">€ 9.99</li>
<li>Criação do WebSite</li>
<li>Sem Dominio</li>
<li class="grey"><a class="btn btn-primary btn-lg" href="precos" role="button">Buy Now</a></li>
</ul>
</div>
<div class="columns">
<ul class="price">
<li class="header">Host + WebSite + Dominio</li>
<li class="grey">€ 9.99/year</li>
<li>Criação do WebSite</li>
<li>Dominio incluido</li>
<li class="grey"><a class="btn btn-primary btn-lg" href="precos" role="button">Buy Now</a></li>
</ul>
</div>
</body>
</html>
请加入jQuery和引导JS –