Angular7:如何阻止URL导航？

import { Injectable } from '@angular/core';
import { CanDeactivate } from '@angular/router';
import { Observable } from 'rxjs';

@Injectable()
export class CanDeactivateGuard implements CanDeactivate<any> {
  canDeactivate(): Observable<boolean> | Promise<boolean> | boolean {
    // 在这里执行阻止导航的逻辑
    // 返回true以允许导航，返回false以阻止导航
    return false;
  }
}

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { HomeComponent } from './home.component';
import { CanDeactivateGuard } from './can-deactivate.guard';

const routes: Routes = [
  {
    path: 'home',
    component: HomeComponent,
    canDeactivate: [CanDeactivateGuard] // 将CanDeactivateGuard与HomeComponent关联
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

import { Injectable } from '@angular/core';
import { CanDeactivate } from '@angular/router';
import { Observable } from 'rxjs';

@Injectable()
export class CanDeactivateGuard implements CanDeactivate<any> {
  canDeactivate(): Observable<boolean> | Promise<boolean> | boolean {
    // 在这里执行阻止导航的逻辑
    const confirmResult = confirm('您有未保存的更改，是否要离开此页面？');
    return confirmResult; // 返回true以允许导航，返回false以阻止导航
  }
}