订阅 BehaviorSubject 会在 Angular 8 中引发错误

Question

在 Angular 8 中处理单页应用程序，其中我将一些数据从组件解析为服务，然后在服务中我使用 rxjs BehaviorSubject.on 编译订阅它 Angular CLI 我得到这个错误 src/app/Services/shared.service.ts(12,21): error TS2554: Expected 1 arguments, but got 0.

似乎无法找到问题所在？

共享服务

import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
import { TokenService } from './token.service';

@Injectable({
  providedIn: 'root'
})

export class SharedService {

    //All children
    private children = new BehaviorSubject;
    checkAll$ = this.children.asObservable();

    childData(data:any){
       this.children.next(data);
    }

    constructor(private Token : TokenService) { }
}

Answer 1

BehaviorSubject 需要一个参数。你没有提供。

private children = new BehaviorSubject(null);

订阅 BehaviorSubject 会在 Angular 8 中引发错误

Subscribing to BehaviorSubject throws error in Angular 8

angular

compilation

rxjs

behaviorsubject