在index.html中而不是app.component.html

Question

在index.html

<style><link rel="stylesheet" href="https://cdn.rtlcss.com/bootstrap/v4.2.1/css/bootstrap.min.css" crossorigin="anonymous"></style>

在main.ts

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {
  enableProdMode();
}

platformBrowserDynamic().bootstrapModule(AppModule)
  .catch(err => console.error(err));

如何通过TranslateService绑定引导样式？