具有多個拆分導航的Bootstrap 4導航欄不會折疊

Question

在此版本中，數位板菜單中僅顯示第一個菜單項。 當我添加樣式顯示時：flex; 到#navbarsExampleDefault，它顯示了其他項目，但隨后我無法折疊/隱藏菜單項。 增加可見性：隱藏； 僅隱藏菜單項，但占用相同的空間。 我只包含一個菜單項以使其簡短。

    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <link rel="icon" href="#">
    <title>Home</title>
    <!--BOOTSTRAP-->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <link rel="stylesheet" type="text/css" href="css/style.css">
    <link href="https://fonts.googleapis.com/css?family=Roboto+Condensed:300,300i,400,400i|Roboto:300,300i,400,400i" rel="stylesheet">

            <button class="btn btn-link navbar-toggler collapsed" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" width="30" height="30" focusable="false"><title>Menu</title><path stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-miterlimit="10" d="M4 7h22M4 15h22M4 23h22"></path></svg>
            </button>

            <!-- SPLIT NAVBARS -->
            <div class="btn-group navbar-collapse collapse" id="navbarsExampleDefault">
              <button type="button" class="btn" id="button-1"><a href="csr-lfg.html">CSR at LF</a></button>
              <button type="button" class="btn dropdown-toggle dropdown-toggle-split" id="button-1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                <span class="sr-only">Toggle Dropdown</span>
              </button>
              <div class="dropdown-menu">
                <a class="dropdown-item" href="#">Submenu Item 1</a>
                <a class="dropdown-item" href="#">Submenu Item 2</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item" href="#">Submenu Item 3</a>
                <a class="dropdown-item" href="#">Submenu Item 4</a>
                <a class="dropdown-item" href="#">Submenu Item 5</a>
                <a class="dropdown-item" href="#">Submenu Item 6</a>
              </div>
            </div>

Answer 1

您錯過了bootstrap.js和pooper.js，可以在此處的下拉菜單中找到更多信息（對於button）

  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" /> <link href="https://fonts.googleapis.com/css?family=Roboto+Condensed:300,300i,400,400i|Roboto:300,300i,400,400i" rel="stylesheet"> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous"> <script src="Scripts/jquery-1.10.2.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></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 bg-light"> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <!-- SPLIT NAVBARS --> <div class="collapse navbar-collapse" id="navbarsExampleDefault"> <button type="button" class="btn" id="button-1"><a href="csr-lfg.html">CSR at LF</a></button> <button type="button" class="btn dropdown-toggle dropdown-toggle-split" id="button-1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span class="sr-only">Toggle Dropdown</span> </button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Submenu Item 1</a> <a class="dropdown-item" href="#">Submenu Item 2</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="#">Submenu Item 3</a> <a class="dropdown-item" href="#">Submenu Item 4</a> <a class="dropdown-item" href="#">Submenu Item 5</a> <a class="dropdown-item" href="#">Submenu Item 6</a> </div> </div> </nav>