Angular 5- Catch连接丢失并重新订阅

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError, retry, switchMap } from 'rxjs/operators';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent implements OnInit {
  data$: Observable<any>;

  constructor(private http: HttpClient) { }

  ngOnInit() {
    this.getData().subscribe(
      data => {
        // 处理数据
      },
      error => {
        console.error('连接丢失:', error);
        this.retryConnection();
      }
    );
  }

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

  retryConnection() {
    this.data$ = this.getData().pipe(
      retry(3), // 重试3次
      catchError(error => {
        console.error('无法重新连接:', error);
        return throwError(error);
      })
    );
  }
}