progress-spinner 概览
<mat-progress-spinner> 和 <mat-spinner> 是一个表示进度和活动的圆形指示符。
<mat-progress-spinner> and <mat-spinner> are a circular indicators of progress and activity.
进度圈支持两种模式：确定（"determinate"）和待定（"indeterminate"）。
The progress-spinner supports two modes, "determinate" and "indeterminate".
The <mat-spinner> component is an alias for <mat-progress-spinner mode="indeterminate">.
模式 Mode |
说明 Description |
|---|---|
| determinate | 标准的进度指示符，填充 0% 到 100% Standard progress indicator, fills from 0% to 100% |
| indeterminate | 表示正在发生某些事情，却没有传达离散的进度 Indicates that something is happening without conveying a discrete progress |
默认模式是确定的（"determinate"）。在该模式下，进度要通过 value 属性进行设置，它可以是 0 到 100 之间的整数。
The default mode is "determinate". In this mode, the progress is set via the value property,
which can be a whole number between 0 and 100.
在 "indeterminate" 模式下，会忽略 value 属性。
In "indeterminate" mode, the value property is ignored.
进度圈的颜色可以通过 color 属性进行修改。默认情况下，进度圈使用主题的主色调（primary）。
它可以修改为 'accent' 或 'warn'。
The color of a progress-spinner can be changed by using the color property. By default,
progress-spinners use the theme's primary color. This can be changed to 'accent' or 'warn'.
每个进度圈都应该通过 aria-label 或 aria-labelledby 给出一个有意义的标签。
Each progress spinner should be given a meaningful label via aria-label or aria-labelledby.