折疊的Bootstrap Navbar不顯示

Question

因此，當折疊時，我的導航欄菜單按鈕可以使用，但是在快速加載動畫之后，該菜單消失了。 不知道為什么會這樣，我搜索了其他問題和引導文檔，無法弄清楚。 該網站是http://philipeckert.com

HTML：

<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="#navbar" 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="#brand">Eckert</a>
    </div>
    <div class="collapse navbar-collapse" id="navbar">
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#gohereforabout">About</a></li>
        <li><a href="#Portfolio">Portfolio</a></li>
        <li><a href="#Contact">Contact</a></li>
      </ul>
    </div>
  </div>
</nav>

CSS：

.navbar-default {
  background-color: rgb(0, 32, 128);
  border-color: #000000;
}

.navbar-default .navbar-brand {
  color: white;
}

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

.nav.navbar-nav.navbar-right li a {
  color: white;
  font-family: 'Ubuntu', sans-serif;
}

@media (max-width: 990px) {
    .navbar-header {
        float: none;
    }
    .navbar-toggle {
        display: block;
    }
    .navbar-collapse {
        border-top: 1px solid transparent;
        box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
    }
    .navbar-collapse.collapse {
        display: none!important;
    }
    .navbar-nav {
        float: none!important;
        margin: 7.5px -15px;
    }
    .navbar-nav>li {
        float: none;
    }
    .navbar-nav>li>a {
        padding-top: 10px;
        padding-bottom: 10px;
    }
}

Answer 1

只需從您的@media查詢中刪除.navbar-collapse.collapse CSS：

/*Remove this */
.navbar-collapse.collapse {
        display: none!important;
}

這是小提琴演示： https : //jsfiddle.net/2pua65co/

Answer 2

刪除此CSS您的style.css第30行

.navbar-collapse.collapse {
    display: none !important;
}

Answer 3

您需要添加以下CSS規則以將其折疊到function屬性：

.navbar.navbar-default .collapse.in {
    display: block !important;
}

有關更多信息，請參見折疊用法 。

工作示例：

 .navbar.navbar-default { background-color: rgb(0, 32, 128); border-color: #000000; } .navbar.navbar-default .navbar-brand { color: white; } .navbar.navbar-default .navbar-toggle .icon-bar { background-color: white; } .navbar.navbar-default .navbar-nav.navbar-right li a { color: white; font-family: 'Ubuntu', sans-serif; } @media (max-width: 990px) { .navbar.navbar-default .navbar-header { float: none; } .navbar.navbar-default .navbar-left, .navbar.navbar-default .navbar-right { float: none !important; } .navbar.navbar-default .navbar-toggle { display: block; } .navbar.navbar-default .navbar-collapse { border-top: 1px solid transparent; box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1); } .navbar.navbar-default.navbar-fixed-top { top: 0; border-width: 0 0 1px; } .navbar.navbar-default .navbar-collapse { overflow: hidden; } .navbar.navbar-default .navbar-collapse.collapse { display: none!important; } .navbar.navbar-default .navbar-nav { float: none!important; margin-top: 7.5px; } .navbar.navbar-default .navbar-nav > li { float: none; } .navbar.navbar-default .navbar-nav > li > a { padding-top: 10px; padding-bottom: 10px; } .navbar.navbar-default .collapse.in { display: block !important; } .navbar.navbar-default .navbar-nav .dropdown-menu > li > a, .navbar.navbar-default .navbar-nav .dropdown-menu > li > a:hover, .navbar.navbar-default .navbar-nav .dropdown-menu > li > a:focus { color: #777; } } 

 <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"> <nav class="navbar navbar-default navbar-fixed-top navbar"> <div class="container-fluid"> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" 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="#brand">Eckert</a> </div> <div class="collapse navbar-collapse" id="navbar"> <ul class="nav navbar-nav navbar-right"> <li><a href="#gohereforabout">About</a> </li> <li><a href="#Portfolio">Portfolio</a> </li> <li><a href="#Contact">Contact</a> </li> </ul> </div> </div> </nav> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>