CanDeactivateGuard与确认订阅不起作用。

要解决CanDeactivateGuard与确认订阅不起作用的问题，可以尝试以下几个步骤：

1. 确保在组件中正确实现了CanDeactivate接口，并在组件中实现canDeactivate方法。canDeactivate方法应该返回一个Observable<boolean>或Promise<boolean>或一个boolean值。示例如下：

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

export interface CanComponentDeactivate {
  canDeactivate: () => Observable<boolean> | Promise<boolean> | boolean;
}

export class MyComponent implements CanDeactivate<CanComponentDeactivate> {
  canDeactivate(component: CanComponentDeactivate) {
    return component.canDeactivate ? component.canDeactivate() : true;
  }
}

2. 确保在组件中正确实现了canDeactivate方法，并在该方法中进行确认订阅。示例如下：

export class MyComponent implements CanComponentDeactivate {
  // ...

  canDeactivate(): Observable<boolean> {
    return new Observable<boolean>((observer) => {
      // 进行确认订阅的逻辑，例如弹出确认对话框
      const confirmation = window.confirm('是否要离开该页面？');
      observer.next(confirmation);
      observer.complete();
    });
  }
}

3. 在路由模块中添加CanDeactivateGuard，并将其与需要进行确认订阅的组件进行关联。示例如下：

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

const routes: Routes = [
  {
    path: 'my-component',
    component: MyComponent,
    canDeactivate: [CanDeactivateGuard]
  }
];

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

4. 创建CanDeactivateGuard，并在该Guard中调用组件的canDeactivate方法。示例如下：

import { Injectable } from '@angular/core';
import { CanDeactivate } from '@angular/router';
import { Observable } from 'rxjs';
import { CanComponentDeactivate } from './my.component';

@Injectable({
  providedIn: 'root'
})
export class CanDeactivateGuard implements CanDeactivate<CanComponentDeactivate> {
  canDeactivate(component: CanComponentDeactivate): Observable<boolean> | Promise<boolean> | boolean {
    return component.canDeactivate ? component.canDeactivate() : true;
  }
}

通过以上步骤，可以确保CanDeactivateGuard与确认订阅正常工作，并在离开页面时进行确认对话框等操作。