如何在导航栏（菜单）项目上应用或更改颜色

Question

我想弄清楚如何在我的导航栏右侧获取图像。一旦它被折叠，我的导航栏右侧也会有一个图像。

另外，我不知道如何在滚动时将导航栏固定在页面顶部。我试过导航栏固定顶部，但无济于事。

我正在使用引导程序

这是我的代码..

.navbar-default .navbar-toggle .icon-bar {
  background-color: white;
}

.navbar-default .navbar-toggle:hover,
.navbar-default .navbar-toggle:focus {
  background-color: transparent !important;
}

.navbar-toggle {
  margin-top: 2em;
  border: none;
  color: white;
}

.navbar-fixed-top {
  position: static !important;
}

.navbar-nav,
.navbar-nav li,
.navbar-nav li a {
  text-align: right;
  font-family: "Montserrat";
  color: white;
}

.navbar.navbar-default .navbar-collapse {
  border: none;
  box-shadow: none;
}

.navbar-fixed-top {
  margin-right: 0em;
  margin-top: 1em;
}

.navbar {
  background-color: transparent;
  background: transparent;
  border-color: transparent;
}

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<div class="container">
  <nav class="navbar navbar-default navbar-fixed-top">
    <div class="container-fluid">
      <div class="navbar-header ">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbarNav">
                      <span class="sr-only">Toggle navigation</span>
                      <span class="icon-bar"></span>
                      <span class="icon-bar"></span>
                      <span class="icon-bar"></span>
                    </button>
      </div>
      <div id="navbarNav" class="navbar-collapse collapse ">
        <br/><br/>
        <ul class="nav navbar-nav navbar-right ">
          <li><a href="#">ABOUT</a></li>
          <li><a href="#">SERVICES</a></li>
          <li><a href="#">CONTACT</a></li>
          <li><a href="#">CALCULATORS</a></li>
        </ul>
      </div>

    </div>
  </nav>
</div>

非常感谢您的任何帮助，非常感谢！

Answer 1

可能是因为 bootstrap 的 CSS 是overriding your own custom CSS。不过，有一个简单的解决方法，您可以实现 your own ID or class on the navbar-nav，正如我在下面使用 ID "links" 演示的那样，并将 CSS 应用到链接上。

.navbar-default .navbar-toggle .icon-bar {
  background-color: white;
}

.navbar-default .navbar-toggle:hover,
.navbar-default .navbar-toggle:focus {
  background-color: transparent !important;
}

.navbar-toggle {
  margin-top: 2em;
  border: none;
  color: white;
}

.navbar-fixed-top {
  position: static !important;
}


#links a {
  text-align: right;
  font-family: "Montserrat";
  color: red;
}

.navbar.navbar-default .navbar-collapse {
  border: none;
  box-shadow: none;
}

.navbar-fixed-top {
  margin-right: 0em;
  margin-top: 1em;
}

.navbar {
  background-color: transparent;
  background: transparent;
  border-color: transparent;
}

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<div class="container">
  <nav class="navbar navbar-default navbar-fixed-top">
    <div class="container-fluid">
      <div class="navbar-header ">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbarNav">
                      <span class="sr-only">Toggle navigation</span>
                      <span class="icon-bar"></span>
                      <span class="icon-bar"></span>
                      <span class="icon-bar"></span>
                    </button>
      </div>
      <div id="navbarNav" class="navbar-collapse collapse ">
        <br/><br/>
        <ul class="nav navbar-nav navbar-right" id="links">
          
          <li><a href="#">ABOUT</a></li>
          <li><a href="#">SERVICES</a></li>
          <li><a href="#">CONTACT</a></li>
          <li><a href="#">CALCULATORS</a></li>
          
        </ul>
      </div>

    </div>
  </nav>
</div>

Answer 2

固定页眉、页面滚动和导航项颜色在滚动时发生变化。

<!DOCTYPE html>
<html>
<head>
  <title>Page Scroll Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  <style>
  body {
      position: relative; 
  }
  #section1 {padding-top:50px;height:500px;color: #fff; background-color: #1E88E5;}
  #section2 {padding-top:50px;height:500px;color: #fff; background-color: #673ab7;}
  #section3 {padding-top:50px;height:500px;color: #fff; background-color: #ff9800;}
  #section41 {padding-top:50px;height:500px;color: #fff; background-color: #00bcd4;}
  #section42 {padding-top:50px;height:500px;color: #fff; background-color: #009688;}
  </style>
</head>
<body data-spy="scroll" data-target=".navbar" data-offset="50">

<nav class="navbar navbar-inverse navbar-fixed-top">
  <div class="container-fluid">
    <div class="navbar-header">
        <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>                        
      </button>
      <a class="navbar-brand" rel="home" href="#" title="Buy Sell Rent Everyting">
                <img style="max-width:100px; margin-top: -7px;"
                     src="//www.google.com/favicon.ico">
            </a>
    </div>
    <div>
      <div class="collapse navbar-collapse" id="myNavbar">
        <ul class="nav navbar-nav">
          <li><a href="#section1">Section 1</a></li>
          <li><a href="#section2">Section 2</a></li>
          <li><a href="#section3">Section 3</a></li>
          <li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Section 4 <span class="caret"></span></a>
            <ul class="dropdown-menu">
              <li><a href="#section41">Section 4-1</a></li>
              <li><a href="#section42">Section 4-2</a></li>
            </ul>
          </li>
        </ul>
      </div>
    </div>
  </div>
</nav>    

<div id="section1" class="container-fluid">
  <h1>Section 1</h1>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
<div id="section2" class="container-fluid">
  <h1>Section 2</h1>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
<div id="section3" class="container-fluid">
  <h1>Section 3</h1>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
<div id="section41" class="container-fluid">
  <h1>Section 4 Submenu 1</h1>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
<div id="section42" class="container-fluid">
  <h1>Section 4 Submenu 2</h1>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
  <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>

</body>
</html>