「Bootstrap4入門」ボタンのアクティブ状態，無効状態のサンプル
書式
.active アクティブ状態
disabled 無効化状態
使用例
<head>
<title>Bootstrapのサンプル</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
<script src="/jquery/3.2.1/jquery.min.js"></script>
<script src="/popper.js/1.15.0/umd/popper.min.js"></script>
<script src="/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>ボタン状態</h2>
<button type="button" class="btn btn-primary">Primary button</button>
<button type="button" class="btn btn-primary active">アクティブ</button>
<button type="button" class="btn btn-primary" disabled>無効状態</button>
<a href="#" class="btn btn-primary disabled">disabled link</a>
</div>
<head>
<title>Bootstrapのサンプル</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
<script src="/jquery/3.2.1/jquery.min.js"></script>
<script src="/popper.js/1.15.0/umd/popper.min.js"></script>
<script src="/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>ボタン状態</h2>
<button type="button" class="btn btn-primary">Primary button</button>
<button type="button" class="btn btn-primary active">アクティブ</button>
<button type="button" class="btn btn-primary" disabled>無効状態</button>
<a href="#" class="btn btn-primary disabled">disabled link</a>
</div>
<head> <title>Bootstrapのサンプル</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="/jquery/3.2.1/jquery.min.js"></script> <script src="/popper.js/1.15.0/umd/popper.min.js"></script> <script src="/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>ボタン状態</h2> <button type="button" class="btn btn-primary">Primary button</button> <button type="button" class="btn btn-primary active">アクティブ</button> <button type="button" class="btn btn-primary" disabled>無効状態</button> <a href="#" class="btn btn-primary disabled">disabled link</a> </div>