angular - 类型\'Observable<{}>\' 不可分配给 Angular 2 中的类型

Question

Observable 无法分配，我的 package.json 文件保存

"angular2": "2.0.0-beta.17",
"systemjs": "0.19.24",
"es6-promise": "^3.0.2",
"es6-shim": "^0.35.0",
"reflect-metadata": "0.1.2",
"rxjs": "5.0.0-beta.6",
"zone.js": "0.6.12"

当我的终端开始编译时出现问题，它向我显示一条错误消息

留言:

'\u001b[31mresources/assets/typescript/services/user.service.ts(25,5): \u001b[39merror TS2322: Type \'Observable<{}>\' is not assignable to type \'Observable\'.\n Type \'{}\' is not assignable to type \'User[]\'.\n Property \'length\' is missing in type \'{}\'.' }

在我的服务组件中，this.loggedUser$ 无法通过构造函数中的新 Observable 进行初始化，它破坏了整个过程。

这是我的服务组件

import {Injectable} from 'angular2/core';
import {Http,Response,Headers} from 'angular2/http';

import {Observable} from 'rxjs/Observable';
import {Observer} from 'rxjs/Observer';
import 'rxjs/add/operator/share';
import 'rxjs/add/operator/map';
import {User} from '../interfaces/interfaces';
export var API_ENDPOINT = 'http://localhost:8080/api';


@Injectable()
export class UserService {

  loggedUser$: Observable<User[]>; 
  private loggedUserObserver: Observer<User[]>;
  private loggedUserInfo:{
        users: User[]
    };

  constructor(private _http: Http) {
    this.loggedUser$ = new Observable(observer => this.loggedUserObserver = observer).share();
    this.loggedUserInfo = { users: [] };
  }


    getLoggedUser(){
      return this._http.get(API_ENDPOINT+'/getLoggedUser')
      .map((res:Response)=>res.json())
      .subscribe(
        data => { 
        this.loggedUserInfo.users = data;
        this.loggedUserObserver.next(this.loggedUserInfo.users);
        },
        err => console.error(err),
        () => console.log(this.loggedUserInfo.users)
      );
    }


}

在我的界面中有

export interface User {
    id?: number,    
    name?: string,
    email?:string,
    email2?: string,
    password?: string,
    mobile?: string,
    profilePicture?:string,
    userTimeZone?: string
}

如果我在构造函数中放置一个类型，例如

this.loggedUser$ = new Observable<User[]>(observer => this.loggedUserObserver = observer).share();

然后它在应用程序组件上向我显示了一个不同的错误，错误不是来自终端，而是来自控制台，它是异常:类型错误:_this.loggedUserObserver 未定义

import {Component,OnInit,} from 'angular2/core';
import {Router,ROUTER_DIRECTIVES} from 'angular2/router';
import {RouteConfig, RouteData} from 'angular2/router';

import {MyProfileComponent} from './settings/my-profile.component';
import {MyCompaniesComponent} from './company/my-companies.component';
import {MyTasksComponent} from './tasks/my-tasks.component';
import {UserComponent} from './user/user.component';

import {Observable} from 'rxjs/Observable';
import 'rxjs/Rx';
import {UserService} from './services/user.service';
import {User} from './interfaces/interfaces';


@Component({
    selector: 'my-app',
    //templateUrl: 'appView/front.html',
    template:`{{loggedUser.name}}`,
    directives:[ROUTER_DIRECTIVES, MyProfileComponent, MyCompaniesComponent,UserComponent],
    providers: [UserService],


})

export class AppComponent{  
    loggedUser: Observable<User[]>;
    loggedUserInfo:User;
    constructor (private _userService: UserService){    
    }


    ngOnInit(){
        this.loggedUser = this._userService.loggedUser$;
        this._userService.getLoggedUser();
    }
}

Answer 1

进行了大量搜索，#majodi 的评论也有帮助。在 service.ts 中，我已经像这样初始化了我的变量

loggedUser$: Observable<User[]>;  
loggedUserObserver: Observer<User[]>;
loggedUserInfo:User[]; 

在服务构造函数中

constructor(private _http: Http) {
    this.loggedUser$ = new Observable<User[]>(
      observer => {
      this.loggedUserObserver = observer;
    }
    ).share();
}

并且在 app.component.ts 文件中我以这种方式调用了我的可观察对象

ngOnInit(){     
    this._userService.loggedUser$.subscribe(latestData => {
       this.loggedUserInfo1 = latestData;

    });      
    this._userService.getLoggedUser(); 
}

这些解决了问题。