MaterialSpinnerComponent
Selector: <material-spinner>
“材料规格进度和活动”后的圆形处理指示器，持续时间不确定。
请参阅http://www.google.com/design/spec/components/progress-activity.html。
要更改处理指示器的颜色，请更改CSS中的border-color：
代码语言：javascript复制material-spinner {
border-color: $mat-red;
}MaterialSpinnerExample
查看示例，查看源码。
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