Bootstrap 4(v4.0.0-beta)透明的固定顶部导航.如何更改Navbar-Collapse菜单的颜色

Question

对于响应式导航，即左侧徽标，在右侧切换图标。我喜欢拥有透明的Navbar，但是带有背景颜色的导航项目崩溃。

<nav class="navbar navbar-expand-lg navbar-light bg-light">
<!--- TRANSPARENT START--->
  <a class="navbar-brand" href="#">LOGO</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
<!--- TRANSPARENT END --->
<!--- COLOURED BG FROM START --->
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active"><a class="nav-link" href="#">Item1</a></li>
      <li class="nav-item"><a class="nav-link" href="#">Item2</a></li>
      <li class="nav-item"><a class="nav-link" href="#">Item3</a></li>
    </ul>
  </div>
<!--- COLOURED BG END --->
</nav>

有没有干净的方法来执行此操作？

ty

Answer 1

您可以实现从" nav"中删除" bg-light"调用并创建媒体查询的" bg-light"调用>

	@media (max-width: 988px) {
		.navbar-nav {
			background-color: #e3e3e3;
			padding: 0 10px;
                        margin-top: 5px;
		}
	}	

<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">
<!--- TRANSPARENT START--->
  <a class="navbar-brand" href="#">LOGO</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
<!--- TRANSPARENT END --->
<!--- COLOURED BG FROM START --->
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active"><a class="nav-link" href="#">Item1</a></li>
      <li class="nav-item"><a class="nav-link" href="#">Item2</a></li>
      <li class="nav-item"><a class="nav-link" href="#">Item3</a></li>
    </ul>
  </div>
<!--- COLOURED BG END --->
</nav>