要动态更改面包屑，您需要使用AsyncPipe以异步方式从Observable获取路由事件。以下是一个代码示例：

在组件类中：

import { Component } from '@angular/core';
import { ActivatedRoute, NavigationEnd, Router } from '@angular/router';
import { filter, map } from 'rxjs/operators';
import { MenuItem } from 'primeng/api';

@Component({
  selector: 'app-breadcrumb',
  templateUrl: './breadcrumb.component.html',
  styleUrls: ['./breadcrumb.component.css']
})
export class BreadcrumbComponent {
  items: MenuItem[];

  constructor(private router: Router, private activatedRoute: ActivatedRoute) {
    this.router.events.pipe(
      filter(event => event instanceof NavigationEnd),
      map(() => this.activatedRoute),
      map(route => {
        while (route.firstChild) route = route.firstChild;
        return route;
      }),
      filter(route => route.outlet === 'primary'),
      mergeMap(route => route.data),
      map(data => {
        if (data.title) {
          // If there is a breadcrumb override, use that instead of the title
          if(typeof data.title === 'function') {
            return data.title(this.activatedRoute.snapshot.params);
          }
          return data.title;
        } else {
          return null;
        }
      })
    ).subscribe((label: string) => {
      if (label) {
        this.items.push({label: label});
      }
    });
  }

  ngOnInit() {
    this.items = [];
  }
}

在组件模板中：

注意：确保已正确导入并安装了Primeng和rxjs模块。