出现在按钮、图标旁的数字或状态标记。
<a href="#">收件箱 <cb-badge>42</cb-badge></a> <cb-button>消息 <cb-badge>4</cb-badge></cb-button>
<a href="#">颜色一 <cb-badge theme="light-blue">1</cb-badge></a> <a href="#">颜色二 <cb-badge theme="green">2</cb-badge></a> <a href="#">颜色三 <cb-badge theme="yellow">3</cb-badge></a> <a href="#">颜色四 <cb-badge theme="red">4</cb-badge></a>