Angular 11 ngx-翻译不适用于app.component以外的其他组件

npm install @ngx-translate/core @ngx-translate/http-loader

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpClientModule, HttpClient } from '@angular/common/http';
import { TranslateModule, TranslateLoader } from '@ngx-translate/core';
import { TranslateHttpLoader } from '@ngx-translate/http-loader';

import { AppComponent } from './app.component';

export function HttpLoaderFactory(http: HttpClient) {
  return new TranslateHttpLoader(http, './assets/i18n/', '.json');
}

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: HttpLoaderFactory,
        deps: [HttpClient]
      }
    })
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

// en.json
{
  "HELLO": "Hello",
  "GOODBYE": "Goodbye"
}

// zh.json
{
  "HELLO": "你好",
  "GOODBYE": "再见"
}

import { Component } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';

@Component({
  selector: 'app-example',
  template: `
    <h1>{{ 'HELLO' | translate }}</h1>
    <p>{{ 'GOODBYE' | translate }}</p>
  `
})
export class ExampleComponent {
  constructor(private translate: TranslateService) {
    translate.setDefaultLang('en');
    translate.use('zh'); // 切换到中文
  }
}