编程学习网为您整理以下代码实例，主要实现：Bootstrap .btn-danger类，希望可以帮到各位朋友。
<!DOCTYPE HTML>
<HTML>
<head>
<Title>bootstrap Example</Title>
<Meta name = "vIEwport" content = "wIDth=device-wIDth, initial-scale = 1">
<link rel = "stylesheet" href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/CSS/bootstrap.min.CSS">
<script src = "https://AJAX.GoogleAPIs.com/AJAX/libs/jquery/3.3.1/jquery.min.Js"></script>
<script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/Js/bootstrap.min.Js"></script>
</head>
<body>
<button type = "button" class = "btn btn-danger">Danger button</button>
</body>
</HTML>
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