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： ~~~ <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> ~~~