<button type="button" class="btn btn-default">默认按钮</button>  
    <button type="button" class="btn btn-primary">原始按钮</button>
     <button type="button" class="btn btn-success">成功按钮</button>
    <button type="button" class="btn btn-info">信息按钮</button>
     <button type="button" class="btn btn-warning">警告按钮</button>
     <button type="button" class="btn btn-danger">危险按钮</button>
      <button type="button" class="btn btn-link">链接按钮</button>