在angular 4中路由更改时自动保存表单/模型内容

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

@Injectable()
export class FormGuard implements CanDeactivate<any> {
  canDeactivate(component: any): Observable<boolean> | Promise<boolean> | boolean {
    if (component.form.dirty) {
      return confirm('表单已更改，是否保存更改？');
    }
    return true;
  }
}

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { FormComponent } from './form.component';
import { FormGuard } from './form.guard';

const routes: Routes = [
  {
    path: 'form',
    component: FormComponent,
    canDeactivate: [FormGuard]
  }
];

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

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

@Component({
  selector: 'app-form',
  templateUrl: './form.component.html',
  styleUrls: ['./form.component.css']
})
export class FormComponent implements OnInit {
  form: any; // 表单模型

  constructor(private route: ActivatedRoute) { }

  ngOnInit() {
    this.route.params.subscribe(params => {
      // 路由参数变化时的逻辑
    });
  }

  saveForm() {
    // 保存表单的逻辑
  }
}