我是这么说的:

class ClassName {
  constructor(private router: Router) {
    router.events.subscribe((value) => {
        // see this 
        console.log(value instanceof NavigationEnd) 
    });
  }
}

在Angular 7中，我用下面的函数解决了在特定页面上启用和禁用导航栏的问题。

首先，您应该导入NavigationEnd

import { NavigationEnd, Router } from '@angular/router';

navbar.component.ts

public isNavbar=false;
ngAfterViewInit() {

    // nabar enable / disable function
    this.router.events.subscribe((event) => {
        if (event instanceof NavigationEnd) {   
            if(event.url.includes('dashboard')){
                this.isNavbar=true;
              }else{
                this.isNavbar=false;
              }
        }
    });
}

navbar.component.html

<mat-toolbar *ngIf="isNavbar" class="mat-elevation-z1 nav-tool-bar">
<button mat-button routerLink="/dashboard" routerLinkActive="active-list-item"><svg aria-hidden="true" focusable="false" data-prefix="fal" data-icon="paper-plane" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="nav-bar-icon svg-inline--fa fa-paper-plane fa-w-16"><path fill="currentColor" d="M464 4.3L16 262.7C-7 276-4.7 309.9 19.8 320L160 378v102c0 30.2 37.8 43.3 56.7 20.3l60.7-73.8 126.4 52.2c19.1 7.9 40.7-4.2 43.8-24.7l64-417.1C515.7 10.2 487-9 464 4.3zM192 480v-88.8l54.5 22.5L192 480zm224-30.9l-206.2-85.2 199.5-235.8c4.8-5.6-2.9-13.2-8.5-8.4L145.5 337.3 32 290.5 480 32l-64 417.1z" class=""></path></svg>
    Campagnes</button>
<button mat-button routerLink="fake" routerLinkActive="active-list-item"><svg aria-hidden="true" focusable="false" data-prefix="fal" data-icon="box-open" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 608 512" class="nav-bar-icon svg-inline--fa fa-box-open fa-w-19"><path fill="currentColor" d="M606.4 143.8L557.5 41c-2.7-5.6-8.1-9-13.9-9C543 32 304 64 304 64S65 32 64.4 32c-5.8 0-11.2 3.5-13.9 9L1.6 143.8c-4.4 9.2.3 20.2 9.6 23l49.5 14.9V393c0 14.7 9.5 27.5 23 31l205.4 54.1c13 3.4 23.7 1.5 29.5 0L524.2 424c13.5-3.6 23-16.4 23-31V181.7l49.5-14.9c9.4-2.8 14-13.8 9.7-23zM73 65.3l180.9 24.3-57.1 99.8-159.9-48.1 36.1-76zm18.2 125.6C208.3 226.1 200.5 224 203.6 224c5.4 0 10.5-2.9 13.3-7.9l71.9-125.5V445L91.2 393V190.9zM516.8 393l-197.6 52V90.5L391.1 216c2.9 5 8 7.9 13.3 7.9 3.1 0-5 2.1 112.4-33.1V393zM411.3 189.3l-57.1-99.8L535 65.3l36.1 76-159.8 48z" class=""></path></svg>
    Ressources</button>
<button mat-button routerLink="fake" routerLinkActive="active-list-item"><svg aria-hidden="true" focusable="false" data-prefix="fal" data-icon="life-ring" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="nav-bar-icon svg-inline--fa fa-life-ring fa-w-16"><path fill="currentColor" d="M256 8C119.033 8 8 119.033 8 256s111.033 248 248 248 248-111.033 248-248S392.967 8 256 8zm168.766 113.176l-62.885 62.885a128.711 128.711 0 0 0-33.941-33.941l62.885-62.885a217.323 217.323 0 0 1 33.941 33.941zM256 352c-52.935 0-96-43.065-96-96s43.065-96 96-96 96 43.065 96 96-43.065 96-96 96zM363.952 68.853l-66.14 66.14c-26.99-9.325-56.618-9.33-83.624 0l-66.139-66.14c66.716-38.524 149.23-38.499 215.903 0zM121.176 87.234l62.885 62.885a128.711 128.711 0 0 0-33.941 33.941l-62.885-62.885a217.323 217.323 0 0 1 33.941-33.941zm-52.323 60.814l66.139 66.14c-9.325 26.99-9.33 56.618 0 83.624l-66.139 66.14c-38.523-66.715-38.5-149.229 0-215.904zm18.381 242.776l62.885-62.885a128.711 128.711 0 0 0 33.941 33.941l-62.885 62.885a217.366 217.366 0 0 1-33.941-33.941zm60.814 52.323l66.139-66.14c26.99 9.325 56.618 9.33 83.624 0l66.14 66.14c-66.716 38.524-149.23 38.499-215.903 0zm242.776-18.381l-62.885-62.885a128.711 128.711 0 0 0 33.941-33.941l62.885 62.885a217.323 217.323 0 0 1-33.941 33.941zm52.323-60.814l-66.14-66.14c9.325-26.99 9.33-56.618 0-83.624l66.14-66.14c38.523 66.715 38.5 149.229 0 215.904z" class=""></path></svg>Support</button></mat-toolbar>

navbar.component.scss

.mat-toolbar {
    padding-top: 2px;
    padding-left: 30px;
    background-color: #fff;
  }
  ::ng-deep .nav-tool-bar{
    button{
     .mat-button-focus-overlay{
       opacity: 0!important;
     }
     .nav-bar-icon{
       width: 16px;
     }
     span{
      font-size: 15px;
     }
    }
    .active-list-item{
        background-color: #c79652;
        span{
          color: #fff;
          font-size: 15px;
          svg{
            path{
              color: #fff;
            }
          }
        }
    }
  }

更改SCSS .active-list-item背景色很重要。

路由器3.0.0-beta。2应该是

this.router.events.subscribe(path => {
  console.log('path = ', path);
});

在Angular 8中，你应该这样做。router.events。订阅((事件:事件)=> {})

例子:

import { Component } from '@angular/core'; 
import { Router, Event } from '@angular/router';
import { NavigationStart, NavigationError, NavigationEnd } from '@angular/router';

@Component({
    selector: 'app-root',
    template: `<router-outlet></router-outlet>`
})
export class AppComponent {

    constructor(private router: Router) {
        //Router subscriber
        this.router.events.subscribe((event: Event) => {
            if (event instanceof NavigationStart) {
                //do something on start activity
            }

            if (event instanceof NavigationError) {
                // Handle error
                console.error(event.error);
            }

            if (event instanceof NavigationEnd) {
                //do something on end activity
            }
        });
   }
}

更清晰的方法是继承RouteAware并实现onNavigationEnd()方法。

它是一个名为@bespunky/angular-zen的库的一部分。

NPM install @bespunky/angular-zen 让你的AppComponent扩展RouteAware并添加一个onNavigationEnd()方法。

import { Component     } from '@angular/core';
import { NavigationEnd } from '@angular/router';
import { RouteAware    } from '@bespunky/angular-zen/router-x';

@Component({
    selector   : 'app-root',
    templateUrl: './app.component.html',
    styleUrls  : ['./app.component.css']
})
export class AppComponent extends RouteAware
{    
    protected onNavigationEnd(event: NavigationEnd): void
    {
        // Handle authentication...
    }
}

RouteAware还有其他好处，比如: ✨任何路由器事件都可以有处理程序方法(Angular支持的路由器事件)。 ✨使用这个。路由器访问路由器 ✨使用这个。访问激活路由的路由 ✨使用this.componentBus访问RouterOutletComponentBus服务

@Ludohen的回答很好，但如果你不想使用instanceof，请使用下面的方法

this.router.events.subscribe(event => {
  if(event.constructor.name === "NavigationStart") {
    // do something...
  }
});

通过这种方式，您可以检查当前事件名称作为字符串，如果事件发生，您可以执行您计划的函数要执行的操作。