angular - Material 2 paletta 对比色

Question

在 paletta 中，我可以看到对比。 如何选择对比色？

作品:

scss
mat-color($button-primary);

不工作

scss 
mat-color($button-primary, contrast(900));

看到底部写着对比。

scss
$mat-red: (
  50: #ffebee,
  100: #ffcdd2,
  200: #ef9a9a,
  300: #e57373,
  400: #ef5350,
  500: #f44336,
  600: #e53935,
  700: #d32f2f,
  800: #c62828,
  900: #b71c1c,
  A100: #ff8a80,
  A200: #ff5252,
  A400: #ff1744,
  A700: #d50000,
  contrast: (
    50: $black-87-opacity,
    100: $black-87-opacity,
    200: $black-87-opacity,
    300: $black-87-opacity,
    400: $black-87-opacity,
    500: white,
    600: white,
    700: white,
    800: $white-87-opacity,
    900: $white-87-opacity,
    A100: $black-87-opacity,
    A200: white,
    A400: white,
    A700: white,
  )
);

如何使用对比度？

Answer 1

color: mat-contrast($mat-red, 900);

引用链接: https://github.com/angular/material2/blob/2.0.0-beta.8/src/lib/core/theming/_theming.scss#L4