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<p>按钮预定义类样式介绍</p>
<hr>
<button type="button" class="btn btn-default">button标签</button>
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<a href="#" role="button" class="btn btn-default">a标签</a>
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<p>按钮预定义了七个类样式</p>
<hr>
<button type="button" class="btn btn-primary">首选项</button>
<button type="button" class="btn btn-success">成功(success)</button>
<button type="button" class="btn btn-info">一般信息(info)</button>
<button type="button" class="btn btn-warning">警告(warning)</button>
<button type="button" class="btn btn-danger">危险(danger)</button>
<button type="button" class="btn btn-link">链接(link)</button>
<hr>
<p>预定义的按钮大小类样式</p>
<hr>
<button type="button" class="btn btn-primary btn-lg">大按钮</button>
<button type="button" class="btn btn-primary btn-sm">小按钮</button>
<button type="button" class="btn btn-default btn-xs">超小按钮</button>
<button type="button" class="btn btn-primary btn-sm btn-block">块级元素(100%显示)</button>
<button type="button" class="btn btn-default btn-sm active">激活状态</button>
<button type="button" class="btn btn-default" disabled="disabled">禁用状态</button>
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