1. 安装@angular/router和@ng-bootstrap/ng-bootstrap模块。
2. 在app.component.ts文件中引入NgbAlert组件，并注入ActivatedRoute服务和NgbService服务。

import { Component } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { NgbService } from '@ng-bootstrap/ng-bootstrap';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  constructor(private route: ActivatedRoute, private ngbService: NgbService) { }

  ngOnInit() {
    this.route.queryParams.subscribe(params => {
      if (params['success']) {
        this.showSuccessAlert();
      }
    });
  }

  showSuccessAlert() {
    this.ngbService.open('Success!', { type: 'success' });
  }
}

3. 在导航时使用queryParams参数传递success参数并设置为true。

import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';

@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.scss']
})
export class HomeComponent implements OnInit {

  constructor(private router: Router) { }

  ngOnInit() {
  }

  onSubmit() {
    this.router.navigate(['/result'], { queryParams: { success: true } });
  }
}

4. 在result.component.html中显示成功提示框。

Success!