如何以编程方式在primeng p-menu中选择项目？

<p-menu [(ngModel)]="selectedItem">
  <p-header>Menu</p-header>
  <ul>
    <li *ngFor="let item of menuItems" [label]="item.label" [icon]="item.icon" [routerLink]="item.routerLink"></li>
  </ul>
</p-menu>

import { Component } from '@angular/core';

@Component({
  selector: 'app-menu',
  templateUrl: './menu.component.html',
  styleUrls: ['./menu.component.css']
})
export class MenuComponent {
  menuItems = [
    { label: 'Home', icon: 'pi pi-home', routerLink: '/home' },
    { label: 'About', icon: 'pi pi-info', routerLink: '/about' },
    { label: 'Contact', icon: 'pi pi-envelope', routerLink: '/contact' }
  ];
  selectedItem: any;
}