使用Angular关闭浏览器窗口/选项卡时执行异步服务get

// 在服务中定义异步请求方法
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class MyService {
  constructor(private http: HttpClient) {}

  getData(): Observable<any> {
    return this.http.get('https://api.example.com/data');
  }
}

// 在组件中使用服务执行异步请求
import { Component, OnDestroy } from '@angular/core';
import { MyService } from './my.service';
import { Subscription } from 'rxjs';

@Component({
  selector: 'app-my-component',
  template: '...',
})
export class MyComponent implements OnDestroy {
  private subscription: Subscription;

  constructor(private myService: MyService) {}

  ngOnDestroy(): void {
    this.subscription = this.myService.getData().subscribe((data) => {
      // 处理返回的数据
      console.log(data);
    });
  }
}