Bootstrap菜单未在移动设备上显示

Question

我无法弄清楚为什么在手机/平板电脑上没有显示引导菜单？ 你可以在这里看到：https://simpleeats.cratejoy.com/

Answer 1

由于您的navbar-brand设置为100％宽度，它实际上覆盖了您的navbar-toggle按钮，这就是为什么当您点击切换按钮时，您将被定向回索引页面：请参阅图像。< / p>

您可以更改navbar-toggle班级（z-index: 1060;的作品）的z-index，也可以设置图片的宽度。

旁注：当您打开菜单时，您会看到因徽标附加img-responsive类而导致的一些不利行为，但您不应该需要此课程。

固定宽度，居中navbar-brand图像的工作演示。

/**FOR DEMO ONLY**/

.navbar .navbar-brand {
  padding-top: 0;
}
.navbar .navbar-toggle.lefty {
  float: left;
  margin-left: 15px;
}
/**FOR DEMO ONLY**/

@media (max-width: 768px) {
  .navbar .navbar-brand {
    position: absolute;
    width: 200px;
    left: 50%;
    transform: translateX(-50%);
    background: red;
  }
  .navbar .navbar-brand img {
    margin: 0 auto;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<nav class="navbar navbar-default">

  <div class="navbar-header">
    <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-nav" aria-expanded="false">
      <span class="sr-only">Toggle navigation</span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
    </button>
    <a class="navbar-brand" href="#">
      <img src="http://placehold.it/150x50">
    </a>
    <!--FOR DEMO ONLY -->
    <button type="button" class="navbar-toggle collapsed lefty" data-toggle="collapse" data-target="#bs-nav" aria-expanded="false">
      <span class="sr-only">Toggle navigation</span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
    </button>
    <!--FOR DEMO ONLY -->
  </div>
  <div class="collapse navbar-collapse" id="bs-nav">
    <ul class="nav navbar-nav navbar-right">
      <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a>
      </li>
      <li><a href="#">Link</a>
      </li>
    </ul>
  </div>

</nav>

Answer 2

尝试添加aria-controls =＆＃34; bs-example-navbar-collapse-1＆＃34;

<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false" aria-controls="bs-example-navbar-collapse-1">