原理：
使用Angular2的命名路由插座，一个用来显示app正常的使用，一个用来显示弹出框

// app.component.html
<router-outlet></router-outlet>
<router-outlet name='popup'></router-outlet>

浏览器的导航栏中则这样显示

http://127.0.0.1:4200/(popup:toast//apps:login)

路由配置

import { ToastComponent } from './components/toast/toast.component';
const routes: Routes = [
  {
    path: 'toast',
    component: ToastComponent,
    outlet: 'popup',
  },
  ...
];

toast内容

// toast.component.html
<div class="wrap">
    <div class="wrap-box">
        <div class="wrap-box-icon">
            <div *ngIf="toastParams.img">
                <img src="{{toastParams.img}}" class="wrap-box-icon-img">
                <div> {{toastParams.title}} </div>
            </div>
            <div *ngIf="!toastParams.img"> {{toastParams.title}} </div>
        </div>
    </div>
</div>

// toast.component.less
.wrap{
    position: fixed;
    top:0;
    left: 0;
    z-index: 3;
    width: 100vw;
    height: 100vh;
    color:#fff;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;

    &-box{
        background: rgba(0,0,0,.65);
        padding: 10px;
        border-radius: 16px;
        max-width: 8rem;

        &-icon{
            max-width: 8.055rem;
            box-sizing: border-box;
            padding: 0 0.444rem;

            &-img{
                height: 0.944rem;
                width: 0.944rem;
                display: block;
                margin: 0 auto 0.333rem;
            }
        }
    }
  }

import { Component, OnInit } from '@angular/core';
import { PopupService } from '../../services/popup.service';

@Component({
  selector: 'app-toast',
  templateUrl: './toast.component.html',
  styleUrls: ['./toast.component.less']
})
export class ToastComponent implements OnInit {
  public toastParams:any;

  constructor(
    private popupSVC: PopupService,
  ) { }

  ngOnInit(): void {
    this.toastParams = this.popupSVC.getToastParams();
  }
}

创建用来跳转至popup路由的服务，例如popup.service

// popup.service.ts
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';

@Injectable({
  providedIn: 'root'
})
export class PopupService {
  private toastParams:any;
  private loadingParams:any;

  constructor(
    private router: Router
  ) { }

  toast(_params:any) {
    this.toastParams = _params;
    let _duration;
    if (_params.duration) {
      _duration = _params.duration;
    } else {
      _duration = 500;
    }
    const _outlets = { 'popup': 'toast' };
    this.router.navigate([{ outlets: _outlets }],{ skipLocationChange: true });
    setTimeout(() => {
      const _outlets2 = { 'popup': null };
      this.router.navigate([{ outlets: _outlets2 }],{ skipLocationChange: true });
    }, _duration);
  }
  getToastParams() {
    return this.toastParams;
  }
}

使用：
一、在app.module.ts中将服务导进来，注册

import { ToastComponent } from './components/toast/toast.component';
import { PopupService } from './services/popup.service';
@NgModule({
  declarations: [
    ToastComponent,
    ...
  ],
  imports: [
    ...
  ],
  providers: [
    PopupService,
    ...
  ],
  bootstrap: [AppComponent]
})

二、在使用的test.ts中导入

import { PopupService } from '../../../services/popup.service';
constructor(
  private popupSVC: PopupService,
) {
}
ngOnInit(): void {
  // 调用
  this.popupSVC.toast({
    img: false, // icon 地址或者false
    title: 'toast文案',
    duration: 2000, //toast多久后消失，默认为500ms
  });
}

原文链接：https://blog.csdn.net/zhy13087344578/article/details/80930564