!DOCTYPE htmlhtmlheadtitleBootstrap Example/titlelink rel = stylesheet href = https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/boot

编程学习网为您整理以下代码实例，主要实现：Bootstrap黄色按钮（警告），希望可以帮到各位朋友。

<!DOCTYPE HTML>
<HTML>
   <head>
      <Title>bootstrap Example</Title>
      <link rel = "stylesheet" href = "https://maxcdn.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://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/Js/bootstrap.min.Js"></script>
   </head>
   <body>
      <button type = "button" class = "btn btn-warning">You are WARNED!</button>
   </body>
</HTML>