<title>Bootstrap 实例 - 按钮大小</title>
<link rel="stylesheet" href="https://cdn.staticfile.net/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.net/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.net/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<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>
<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>
<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>
<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>
<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>
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