如何将多个电子邮件地址的验证添加到一个以逗号分隔的收件人字段- Angular 5

<form [formGroup]="emailForm" (ngSubmit)="submitForm()">
  <label for="recipients">收件人：</label>
  <input type="text" id="recipients" formControlName="recipients">
  <div *ngIf="emailForm.controls.recipients.invalid && emailForm.controls.recipients.touched">
    <div *ngIf="emailForm.controls.recipients.errors.required">收件人不能为空。</div>
    <div *ngIf="emailForm.controls.recipients.errors.email">请输入有效的电子邮件地址。</div>
  </div>
  <button type="submit">提交</button>
</form>

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';

@Component({
  selector: 'app-email-form',
  templateUrl: './email-form.component.html',
  styleUrls: ['./email-form.component.css']
})
export class EmailFormComponent implements OnInit {
  emailForm: FormGroup;

  constructor(private formBuilder: FormBuilder) { }

  ngOnInit() {
    this.emailForm = this.formBuilder.group({
      recipients: ['', [Validators.required, Validators.email]]
    });
  }

  submitForm() {
    if (this.emailForm.valid) {
      const recipients = this.emailForm.value.recipients.split(',');
      for (let recipient of recipients) {
        // 验证电子邮件地址的格式
        if (!this.validateEmail(recipient.trim())) {
          // 处理无效的电子邮件地址
          console.log('无效的电子邮件地址：', recipient);
        }
      }
      // 提交表单
      console.log('提交表单');
    }
  }

  validateEmail(email: string): boolean {
    // 使用正则表达式验证电子邮件地址的格式
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email);
  }
}