badge（数字角标）

数字角标一般和其它控件（列表、9宫格、选项卡等）配合使用，用于进行数量提示。角标的核心类是.mui-badge，默认为实心灰色背景；同时，mui还内置了蓝色（blue）、绿色(green)、黄色(yellow)、红色(red)、紫色(purple)五种色系的数字角标，如下：

<span class="mui-badge">1</span>
<span class="mui-badge mui-badge-primary">12</span>
<span class="mui-badge mui-badge-success">123</span>
<span class="mui-badge mui-badge-warning">3</span>
<span class="mui-badge mui-badge-danger">45</span>
<span class="mui-badge mui-badge-purple">456</span>

若无需底色，则增加.mui-badge-inverted类即可，如下：

• Item 1 11
• Item 2 22
• Item 3 33
• Item 4 44
• Item 5 55

<span class="mui-badge mui-badge-inverted">1</span>
<span class="mui-badge mui-badge-primary mui-badge-inverted">2</span>
<span class="mui-badge mui-badge-success mui-badge-inverted">3</span>
<span class="mui-badge mui-badge-warning mui-badge-inverted">4</span>
<span class="mui-badge mui-badge-danger mui-badge-inverted">5</span>
<span class="mui-badge mui-badge-royal mui-badge-inverted">6</span>

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