Angular 角度6.下一步为类方法询问值

我试图设置一个行为主题，但它要求为我的课堂方法设置一个值：

private currentUserSubject = new BehaviorSubject<LoggedInUser>({} as LoggedInUser);

this.currentUserSubject.next(
    {
        name: decodedJwtData.name,
        id: decodedJwtData.id,
        isGlobalAdmin: decodedJwtData.isGlobalAdmin === "True",
        currentRole: decodedJwtData.currentRole
    }
);

类方法已计算，我应该为其提供什么？

可以使用新的LoggedInUser获得包含isAdmin方法的有效LoggedInUser对象。在本例中，必须提供这样一个对象作为BehaviorSubject的初始值，并作为下一个方法的参数

可以使用可选参数定义类构造函数：

export class LoggedInUser {

  constructor( 
    public name?: string,
    public id?: string,
    public isGlobalAdmin?: boolean,
    public currentRole?: string) {}

    isAdmin() {
        return this.isGlobalAdmin || this.currentRole == Roles.Owner  || this.currentRole == Roles.Administrator;
    }
}

然后，可以使用null或默认LoggedInUser对象初始化BehaviorSubject：

export class LoggedInUser {

  constructor( 
    public name?: string,
    public id?: string,
    public isGlobalAdmin?: boolean,
    public currentRole?: string) {}

    isAdmin() {
        return this.isGlobalAdmin || this.currentRole == Roles.Owner  || this.currentRole == Roles.Administrator;
    }
}

new BehaviorSubject<LoggedInUser>(null);
new BehaviorSubject<LoggedInUser>(new LoggedInUser());

this.currentUserSubject.next(
  new LoggedInUser(
    decodedJwtData.name, 
    decodedJwtData.id, 
    decodedJwtData.isGlobalAdmin === "True", 
    decodedJwtData.currentRole)
);