导航栏背景显示不正确，菜单不能点击下拉

Question

我想让我的导航栏背景在所有屏幕上都显示为白色。有什么可以阻止这种情况发生？我将css更改为！默认情况下很重要，它只能在宽范围内正确显示。我曾尝试在中小尺寸屏幕上添加媒体查询，但没有运气。另外，我的菜单正在下降。

.navbar-default { 
 
    background-color:white !important; 
 
    border-color: white !important; 
 
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> 
 

 
<nav class="navbar navbar-default"> 
 
    <div class="container-fluid"> 
 
    <!-- Brand and toggle get grouped for better mobile display --> 
 
    <div class="navbar-header"> 
 
     \t <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> 
 
     <span class="sr-only">Toggle navigation</span> 
 
     <span class="icon-bar"></span> 
 
     <span class="icon-bar"></span> 
 
     <span class="icon-bar"></span> 
 
     \t </button> 
 
     <a class="navbar-brand" href="#"><img src=".png" alt=""/>&#160;<span class="ms-rteThemeForeColor-1-0 ms-rteFontSize-4 ms-rteFontFace-5"></span></a> 
 
    </div> 
 

 
    <!-- Collect the nav links, forms, and other content for toggling --> 
 
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> 
 
     <ul class="nav navbar-nav"> 
 
     <li class="active"><a href="#">Home<span class="sr-only">(current)</span></a></li> 
 
     <li><a href="#">site1</a></li> 
 
     <li><a href="#">site2</a></li> 
 
      <li><a href="#">Site 3</a></li> 
 
        <li><a href="#">Site 4</a></li></ul> 
 
       </div><!-- /.navbar-collapse --> 
 
    </div><!-- /.container-fluid --> 
 
</nav>

Answer 1

执行following--

1. 添加<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
2. 使用data-target="#bs-example-navbar-collapse-1"。请使用!important而不是使用id和样式。
3. 引导CSS后添加自定义CSS。

工作片断

#mynav { 
 
    background-color:white; 
 
    border-color: white; 
 
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> 
 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> 
 
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> 
 

 
<nav id="mynav" class="navbar navbar-default"> 
 
    <div class="container-fluid"> 
 
    <!-- Brand and toggle get grouped for better mobile display --> 
 
    <div class="navbar-header"> 
 
     \t <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false" aria-controls="navbar"> 
 
     <span class="sr-only">Toggle navigation</span> 
 
     <span class="icon-bar"></span> 
 
     <span class="icon-bar"></span> 
 
     <span class="icon-bar"></span> 
 
     \t </button> 
 
     <a class="navbar-brand" href="#"><img src=".png" alt=""/>&#160;<span class="ms-rteThemeForeColor-1-0 ms-rteFontSize-4 ms-rteFontFace-5"></span></a> 
 
    </div> 
 

 
    <!-- Collect the nav links, forms, and other content for toggling --> 
 
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> 
 
     <ul class="nav navbar-nav"> 
 
     <li class="active"><a href="#">Home<span class="sr-only">(current)</span></a></li> 
 
     <li><a href="#">site1</a></li> 
 
     <li><a href="#">site2</a></li> 
 
      <li><a href="#">Site 3</a></li> 
 
        <li><a href="#">Site 4</a></li></ul> 
 
       </div><!-- /.navbar-collapse --> 
 
    </div><!-- /.container-fluid --> 
 
</nav>

希望这有助于！