方法一：

app.module.ts

import {ModalModule} from 'ngx-bootstrap/modal';
ModalModule.forRoot()

app.component.html

<button class="btn btn-outline-primary" (click)="myModal.show()">模態框</button>
<div bsModal #myModal="bs-modal" class="modal fade" tabindex="-1" role="dialog"
    aria-labelledby
 
="myModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-primary" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <h4 class="modal-title">模態框</h4>
                <button type="button" class=
 
"close" (click)="myModal.hide()" aria-label="Close">
                    <span aria-hidden="true">&times;</span>
                </button>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-outline-secondary"
 
>確定</button>
                <button type="button" class="btn btn-outline-primary">取消
                </button>
            </div>
        </div>
    </div>
</div>

方法二：

app.module.ts

import {ModalModule} from 'ngx-bootstrap/modal';
ModalModule.forRoot()

app.component.ts

import { Component } from '@angular/core';
import { TemplateRef } from '@angular/core';
import { BsModalService } from 'ngx-bootstrap/modal';
import { BsModalRef } from 'ngx-bootstrap/modal/bs-modal-ref.service';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  modalRef: BsModalRef;
  constructor(private modalService: BsModalService) {}
 
  openModal(template: TemplateRef<any>) {
    this.modalRef = this.modalService.show(template);
  }
}

app.component.html

<button type="button" class="btn btn-primary" (click)="openModal(template)">模態框</button>
 
<ng-template #template>
  <div class="modal-header">
    <h4 class="modal-title pull-left">Modal</h4>
    <button type="button" class="close pull-right" aria-label="Close" (click)="modalRef.hide()">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>
  <div class="modal-body">
    This is a modal.
  </div>
</ng-template>