Angular6:仅获取不同的订阅

import { Component, OnInit } from '@angular/core';
import { Observable } from 'rxjs';
import { distinctUntilChanged } from 'rxjs/operators';

@Component({
  selector: 'app-example',
  template: `
    <div>{{ data$ | async }}</div>
  `,
})
export class ExampleComponent implements OnInit {
  data$: Observable<any>;

  ngOnInit() {
    this.data$ = this.getData().pipe(
      distinctUntilChanged()
    );
  }

  getData(): Observable<any> {
    // 在这里获取数据的逻辑
  }
}