Bootstrap 4导航栏未显示 [英] Bootstrap 4 navbar not showing
本文介绍了Bootstrap 4导航栏未显示的处理方法，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
我正在尝试使用Bootstrap 4创建导航栏. 这是我的package.json文件的内容:
I am trying to create a navbar using Bootstrap 4. Here is the content og my package.json file :
{
"name": "NAME here",
"version": "1.0.0",
"description": "Descripttion ges there",
"main": "index.html",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "author's name",
"license": "ISC",
"dependencies": {
"bootstrap": "^4.0.0",
"jquery": "^3.3.1",
"popper.js": "^1.12.9"
}
}
这是页面index.html的代码
and here is the code of the page index.html
<!Doctype html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0" />
<meta name="description" content="description here"/>
<meta name="author" content="author's name and contact" />
<link rel="stylesheet" href="./node_modules/bootstrap/dist/css/bootstrap.min.css" />
<title>Bienvenue a TSL Group</title>
</head>
<body>
<div class="container">
<div class="row">
<nav class="navbar navbar-default" role="navigation">
<div class="navbar-header">
<a class="navbar-brand">Brand name</a>
</div>
<div class="navbar-collapse collapse navbar-right">
<ul class="nav navbar-nav">
<li>
<a href="">welcome</a>
</li>
<li>
<a href="">Products</a>
</li>
<li>
<a href=""> Services</a>
</li>
<li>
<a href="">Menu </a>
</li>
<li>
<a href="">Contact us</a>
</li>
</ul>
</div>
</nav>
</div>
</div>
</body>
<script type="text/javascript" src="./node_modules/jquery/dist/jquery.min.js"></script>
<script type="text/javascript" src="./node_modules/bootstrap/dist/js/bootstrap.min.js">
</script>
</html>
但是不幸的是，当我在浏览器中运行页面时，导航栏未显示.我不知道这段代码有什么问题. 有帮助吗?
But unfortunately, when I run the page in the browser, the navbar is not displayed. I don't know what is wrong with this code. Any help?
推荐答案
未显示，因为Bootstrap 4的类和结构与Bootstrap 3不同.
It's not showing because the Bootstrap 4 classes and structure are different from Bootstrap 3.
也很重要:
加载JavaScript文件时，必须先加载jQuery，然后加载Popper.js，然后再加载Bootstrap.js.
When loading JavaScript files, you must load jQuery first, then Popper.js and then Bootstrap.js.
这是Bootstrap 4导航栏的外观:
This is what a Bootstrap 4 navbar looks like:
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
这篇关于Bootstrap 4导航栏未显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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