Bootstrap的模式在Angular应用程序中没有弹出吗？

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>

<button (click)="openModal()" class="btn btn-primary">打开模态框</button>

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

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent {
  modalOpen = false;

  openModal() {
    this.modalOpen = true;
  }

  closeModal() {
    this.modalOpen = false;
  }
}

<div class="modal" [class.show]="modalOpen">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title">模态框标题</h5>
        <button type="button" class="btn-close" (click)="closeModal()"></button>
      </div>
      <div class="modal-body">
        <p>模态框内容</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" (click)="closeModal()">关闭</button>
        <button type="button" class="btn btn-primary">保存</button>
      </div>
    </div>
  </div>
</div>