Bootstrap 4 导航栏未显示 [英] Bootstrap 4 navbar not showing

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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:

<代码>{"name": "这里的名字",版本":1.0.0"，"description": "描述在那里","main": "index.html",脚本":{"test": "echo "Error: no test specified" && exit 1"},"author": "作者姓名","许可证": "ISC",依赖关系":{"引导程序": "^4.0.0","jquery": "^3.3.1","popper.js": "^1.12.9"}}

这里是页面 index.html 的代码

 <头><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="作者姓名和联系方式"/><link rel="stylesheet" href="./node_modules/bootstrap/dist/css/bootstrap.min.css"/><title>Bienvenue a TSL Group</title><身体><div class="容器"><div class="row"><nav class="navbar navbar-default" role="navigation"><div class="navbar-header"><a class="navbar-brand">品牌名称</a>

<div class="navbar-collapse collapse navbar-right"><ul class="nav navbar-nav"><li><a href="">欢迎</a><li><a href="">产品</a><li><a href="">服务<li><a href="">菜单</a><li><a href="">联系我们</a>

</nav>

<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">

但不幸的是，当我在浏览器中运行页面时，导航栏没有显示.我不知道这段代码有什么问题.有什么帮助吗?

解决方案

它没有显示，因为 Bootstrap 4 的类和结构与 Bootstrap 3 不同.

同样重要:

加载 JavaScript 文件时，必须先加载 jQuery，然后是 Popper.js，然后是 Bootstrap.js.

这是 Bootstrap 4 导航栏的样子:

<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"cross/脚本><script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7xfakfakvskin匿名"></script><script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjPVCUar5"7xSfFWpi1MquVdAyjPVCUar5<6/脚本><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导航"><span class="navbar-toggler-icon"></span><div class="collapse navbar-collapse" id="navbarSupportedContent"><ul class="navbar-nav mr-auto"><li class="nav-item active"><a class="nav-link" href="#">首页 <span class="sr-only">(current)</span></a><li class="nav-item"><a class="nav-link" href="#">Link</a><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">落下</a><div class="下拉菜单" aria-labelledby="navbarDropdown"><a class="dropdown-item" href="#">Action</a><a class="dropdown-item" href="#">另一个动作</a><div class="dropdown-divider"></div><a class="dropdown-item" href="#">这里还有别的东西</a>

<li class="nav-item"><a class="nav-link disabled" href="#">Disabled</a><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">搜索</button></表单>

</nav>

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"
  }
}

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>

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?

解决方案

It's not showing because the Bootstrap 4 classes and structure are different from Bootstrap 3.

Also important:

When loading JavaScript files, you must load jQuery first, then Popper.js and then Bootstrap.js.

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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