免責聲明：我對 Angular 和 RXJS 都是超級新手。我有一個簡單的表單，我試圖從中創建一個可觀察的對象。這將查找submit事件并更新組件中的某些值。但是，我收到一個this._subscribe is not a function錯誤。<form (submit)='submitForm()'>  <button type='submit'>Submit</button></form>我的組件import { Component, OnInit } from '@angular/core';import { Observable } from 'rxjs';import UtilsHelperService from '../services/utils-helper.service';@Component({...stuffs...})export class HomeComponent implements OnInit {  formSubmit: Observable<any>;  counter = 0;   constructor() { }  ngOnInit() {    const form = document.getElementsByTagName('form')[0];    this.formSubmit = Observable.create(form, 'submit');  }  submitForm() {    this.formSubmit.subscribe(      UtilsHelperService.formSubmitObserver(this.counter));  }}還有我的utils-helper.service.ts助手班...import {Injectable} from '@angular/core';@Injectable({  providedIn: 'root'})export default class UtilsHelperService {  static formSubmitObserver(counter) {    return {      next: (value) => {        counter++;      },      error: err => console.log(err),      complete: () => console.log('complete')    }  }}我看到formSubmit觀察者創建得很好。我有一個UtilsHelperService.formSubmitObserver方法，它返回一個observer具有 3 個必要方法的對象。所以，我不確定是我做錯了 Angular 的東西（我猜不是）還是 RXjs 的東西。