bootstrap导航栏垂直显示而不是水平显示 [英] bootstrap navbar displays vertically instead of horizontally
本文介绍了bootstrap导航栏垂直显示而不是水平显示的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的页面上 navbar 垂直显示，而不是水平显示。
On my page navbar appears vertically instead of horizontally.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1,shrink-to-fit=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>
Home | Bootstrap
</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
<nav class="navbar navbar-light bg-faded">
<a class="navbar-brand" href="#">My bootstrap application</a>
<ul class="nav navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="index.html">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="about.html">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contact.html">Contact</a>
</li>
</ul>
<form class="form-inline pull-xs-right">
<input class="form-control" type="text" placeholder="Search" />
<button class="btn btn-primary" type="submit">Search</button>
</form>
</nav>
<div class="container">
<div class="row">
<div class="col-lg-12">
<h1>hello world!</h1>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-lg-12">
Bootstrap 4
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="js/bootstrap.min.js"></script>
</body>
</html>
这是为什么？根据文档，它应该是水平的默认值。
Why is that? According to the docs it should horizontal by default.
推荐答案
添加 navbar-toggleable-md class md 视图中水平显示：
Add navbar-toggleable-md class in nav element to make it looks horizontally in md view :
文档：
Docs :
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