异步HTTP调用，直到在Angular中满足条件

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent implements OnInit {
  data: any;
  condition: boolean = false;

  constructor(private http: HttpClient) { }

  ngOnInit() {
    this.makeAsyncHttpCall();
  }

  makeAsyncHttpCall() {
    this.http.get('https://api.example.com/data').subscribe(response => {
      this.data = response;
      this.checkCondition();
    });
  }

  checkCondition() {
    // 根据条件判断是否满足条件
    if (this.data && this.data.length > 0) {
      this.condition = true;
      // 满足条件后执行其他操作
      // ...
    } else {
      // 不满足条件，继续进行异步HTTP调用
      this.makeAsyncHttpCall();
    }
  }
}