<!-- 标准的按钮 -->
<button type="button" class="btn btn-default">默认按钮</button>
<!-- 提供额外的视觉效果，标识一组按钮中的原始动作 -->
<button type="button" class="btn btn-primary">原始按钮</button>
<!-- 表示一个成功的或积极的动作 -->
<button type="button" class="btn btn-success">成功按钮</button>
<!-- 信息警告消息的上下文按钮 -->
<button type="button" class="btn btn-info">信息按钮</button>
<!-- 表示应谨慎采取的动作 -->
<button type="button" class="btn btn-warning">警告按钮</button>
<!-- 表示一个危险的或潜在的负面动作 -->
<button type="button" class="btn btn-danger">危险按钮</button>
<!-- 并不强调是一个按钮，看起来像一个链接，但同时保持按钮的行为 -->
<button type="button" class="btn btn-link">链接按钮</button>

<p>
 <button type="button" class="btn btn-primary btn-lg">大的原始按钮</button>
 <button type="button" class="btn btn-default btn-lg">大的按钮</button>
</p>
<p>
 <button type="button" class="btn btn-primary">默认大小的原始按钮</button>
 <button type="button" class="btn btn-default">默认大小的按钮</button>
</p>
<p>
 <button type="button" class="btn btn-primary btn-sm">小的原始按钮</button>
 <button type="button" class="btn btn-default btn-sm">小的按钮</button>
</p>
<p>
 <button type="button" class="btn btn-primary btn-xs">特别小的原始按钮</button>
 <button type="button" class="btn btn-default btn-xs">特别小的按钮</button>
</p>
<p>
 <button type="button" class="btn btn-primary btn-lg btn-block">块级的原始按钮</button>
 <button type="button" class="btn btn-default btn-lg btn-block">块级的按钮</button>
</p>

<p>
 <button type="button" class="btn btn-default btn-lg ">默认按钮</button>
 <button type="button" class="btn btn-default btn-lg active">激活按钮</button>
</p>
<p>
 <button type="button" class="btn btn-primary btn-lg ">原始按钮</button>
 <button type="button" class="btn btn-primary btn-lg active">激活的原始按钮</button>
</p>

<p>
 <button type="button" class="btn btn-default btn-lg">默认按钮</button>
 <button type="button" class="btn btn-default btn-lg" disabled="disabled">禁用按钮</button>
</p>
<p>
 <button type="button" class="btn btn-primary btn-lg ">原始按钮</button>
 <button type="button" class="btn btn-primary btn-lg" disabled="disabled">禁用的原始按钮</button>
</p>
<p>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="btn btn-default btn-lg" role="button">链接</a>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="btn btn-default btn-lg disabled" role="button">禁用链接</a>
</p>
<p>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="btn btn-primary btn-lg" role="button">原始链接</a>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="btn btn-primary btn-lg disabled" role="button">禁用的原始链接</a>
</p>

<a class="btn btn-default" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" role="button">链接</a>
<button class="btn btn-default" type="submit">按钮</button>
<input class="btn btn-default" type="button" value="输入">
<input class="btn btn-default" type="submit" value="提交">