如何通过索引/序数遍历Angular 5中的枚举？

enum Color {
  Red,
  Blue,
  Green
}

import { Component } from '@angular/core';

enum Color {
  Red,
  Blue,
  Green
}

@Component({
  selector: 'app-example',
  template: `
    <div *ngFor="let index of getIndexes(color)">
      {{ index }} - {{ color[index] }}
    </div>
  `
})
export class ExampleComponent {
  color = Color; // 将枚举赋值给一个变量

  getIndexes(enumType: any) {
    return Object.keys(enumType).filter(k => typeof enumType[k] === 'number');
  }
}