如何仅在响应成功时才使表单路由(角度4)

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

@Injectable()
export class FormDataResolver implements Resolve<any> {
  resolve(): Observable<any> {
    // 在这里获取和处理表单数据
    // 返回一个Observable对象，当数据准备好后发出
  }
}

import { Routes } from '@angular/router';
import { FormDataResolver } from './form-data.resolver';
import { FormComponent } from './form.component';

const routes: Routes = [
  {
    path: 'form',
    component: FormComponent,
    resolve: {
      formData: FormDataResolver
    }
  }
];

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

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

  constructor(private route: ActivatedRoute) {
    this.formData = this.route.snapshot.data.formData;
  }
}