修复了手机上的导航栏答案

【问题标题】：Fixed navigation bar on mobile修复了手机上的导航栏
【发布时间】：2018-12-03 18:57:35
【问题描述】：

我试图让我的导航栏仅在用户使用移动设备访问该网站时固定在顶部。到目前为止，我已经尝试通过使用媒体查询来做到这一点。当我使用 Google chrome 功能“检查”来查看我的网站在移动设备上的外观时，它可以工作，但是当我上传网站并从实际的移动设备访问它时，导航栏不再固定在顶部。 link to the site

更新：固定的导航栏在 safari 中根本不起作用，并且在 google chrome 中放置在错误的位置

<!--NAVIGATION BAR-->
<!DOCTYPE html>

   <nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <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="navbar-nav mr-auto">
  <li class="nav-item active">
    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link</a>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Dropdown
    </a>
    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
      <a class="dropdown-item" href="#">Action</a>
      <a class="dropdown-item" href="#">Another action</a>
      <div class="dropdown-divider"></div>
      <a class="dropdown-item" href="#">Something else here</a>
    </div>
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#">Disabled</a>
  </li>
</ul>
<form class="form-inline my-2 my-lg-0">
  <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
  <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
CSS


 @media only screen and (max-width: 768px) {
     .navbar {
         position: fixed;
         z-index: 1;
         width: 100%;
     }
 }

 @media only screen and (max-width: 768px) {
     .carousel {
         margin-top: 60px;
     }
 }

 .navbar {
     background-color: #2A2F35;
     padding: 0 !important;
 }

 .navbar-nav a {
     font-family: 'Open Sans', sans-serif;
     font-style: normal;
     font-size: 14px;
     font-weight: 400;
     line-height: 22px;
     letter-spacing: 0.5px;
     color: #ffffff !important;
     padding: 25px 0px 25px 0px;
     margin: 0px 15px 0px 15px;

}

【问题讨论】：

标签： css bootstrap-4 media-queries

【解决方案1】：

我刚刚在手机上进行了测试，导航栏似乎已修复没问题。也许添加此元标记会对您有所帮助 <meta name="viewport" content="width=device-width, initial-scale=1">

【讨论】：

你是在什么浏览器中查看的？
Google Chrome Android 8.0 最新版本

【解决方案2】：

以此为参考

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <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="navbar-nav mr-auto">
  <li class="nav-item active">
    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link</a>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Dropdown
    </a>
    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
      <a class="dropdown-item" href="#">Action</a>
      <a class="dropdown-item" href="#">Another action</a>
      <div class="dropdown-divider"></div>
      <a class="dropdown-item" href="#">Something else here</a>
    </div>
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#">Disabled</a>
  </li>
</ul>
<form class="form-inline my-2 my-lg-0">
  <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
  <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>

【讨论】：