Bootstrap 导航栏链接颜色不会改变 [英] Bootstrap navbar link color won't change

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本文介绍了Bootstrap 导航栏链接颜色不会改变的处理方法，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

我需要将我的导航栏链接更改为白色，并将它们在导航栏中隔开.我已经为此编写了代码，但我似乎无法弄清楚它为什么/在哪里不断被覆盖.导航栏的背景是一个图像，链接似乎在没有图像的情况下变为白色，那么有没有办法解决这个问题并将图像保留在背景中?

谁能帮我理解我做错了什么?

.navbar {背景图片:url("图片/navbarbgnew.png");背景尺寸:封面；边距:-30px 0 15px 0;}.navbar ul {显示:弹性；justify-content:空间环绕；}.navbar ul li a {颜色:#FFF；字体系列:Helvetica"，无衬线字体；字体粗细:600；字体大小:14px；}

<li class="nav-item dropdown"><a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">学习实验室</a><div class="下拉菜单" aria-labelledby="navbarDropdownMenuLink"><a class="dropdown-item" href="#">研讨会</a><a class="dropdown-item" href="#">Classes</a><a class="dropdown-item" href="#">音频下载</a>

<li class="nav-item"><a class="nav-link" href="#">SERVICES</a>

</nav>

解决方案

谁能帮我理解我做错了什么?

您的自定义 css 规则的特异性必须匹配或超过相应 Bootstrap 规则的特异性.

因此，在这种特殊情况下，您需要一个如下所示的规则:

.navbar-light .navbar-nav .nav-link {红色;}

点击下面的运行代码片段"按钮并展开到整页以验证它是否有效:

<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>/脚本><script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7xfakfakvgin="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><风格>.navbar-light .navbar-nav .nav-link {红色;}</风格><nav class="navbar navbar-expand-md navbar-light bg-light mb-3"><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></button><div class="collapse navbar-collapse" id="navbarSupportedContent"><ul class="nav navbar-nav"><li class="nav-item dropdown"><a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">图书</a><div class="下拉菜单" aria-labelledby="navbarDropdownMenuLink"><a class="dropdown-item" href="#">品牌经</a>

<li class="nav-item dropdown"><a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">学习实验室</a><div class="下拉菜单" aria-labelledby="navbarDropdownMenuLink"><a class="dropdown-item" href="#">研讨会</a><a class="dropdown-item" href="#">Classes</a><a class="dropdown-item" href="#">音频下载</a>

<li class="nav-item"><a class="nav-link" href="#">SERVICES</a>

</nav>

有关 CSS 特异性的更多信息:

https://developer.mozilla.org/en-US/文档/Web/CSS/Specificity

还有:CSS 特异性计算器

I need to change my navbar links to white and space them out across the navbar. I have written code for this but I can't seem to figure out why/where it keeps getting overridden. The background of the navbar is an image and the links seem to change to white without the image in there, so is there a way to fix that and keep the image in the background?

Can anyone help me understand what I'm doing wrong?

.navbar {
  background-image: url("images/navbarbgnew.png");
  background-size: cover;
  margin: -30px 0 15px 0;
}

.navbar ul {
  display: flex;
  justify-content: space-around;
}

.navbar ul li a {
  color: #FFF;
  font-family: "Helvetica," sans-serif;
  font-weight: 600;
  font-size: 14px;
}

<nav class="navbar navbar-expand-md navbar-light bg-light mb-3">
  <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="nav navbar-nav">
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          BOOKS
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="#">Branding Sutra</a>
        </div>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          LEARNING LAB
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="#">Workshops</a>
          <a class="dropdown-item" href="#">Classes</a>
          <a class="dropdown-item" href="#">Audio Downloads</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">SERVICES</a>
      </li>
    </ul>
  </div>
</nav>

解决方案

Can anyone help me understand what I'm doing wrong?

The specificity of your custom css rule must either match or exceed the specificity of the corresponding Bootstrap rule.

So, in this particular case you need a rule that looks like this: 

.navbar-light .navbar-nav .nav-link {
    color: red;
}

Click "run code snippet" button below and expand to full page to verify that it works: 

<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>
    
<style>
.navbar-light .navbar-nav .nav-link {
    color: red;
}
</style>

<nav class="navbar navbar-expand-md navbar-light bg-light mb-3">
    <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="nav navbar-nav">
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    BOOKS
                </a>
                <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <a class="dropdown-item" href="#">Branding Sutra</a>
                </div>
            </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    LEARNING LAB
                </a>
                <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <a class="dropdown-item" href="#">Workshops</a>
                    <a class="dropdown-item" href="#">Classes</a>
                    <a class="dropdown-item" href="#">Audio Downloads</a>
                </div>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">SERVICES</a>
            </li>
        </ul>
    </div>
</nav>

More info about CSS specificity:

https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity

And: CSS Specificity Calculator

这篇关于Bootstrap 导航栏链接颜色不会改变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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