javascript - Angular 2可观察/主题无法读取属性 'next'

Question

我发现了这篇很棒的帖子Creating and returning Observable from Angular 2 Service现在我尝试做同样的事情，但得到这个错误:

core.umd.js:2838 EXCEPTION: Cannot read property 'next' of undefined

这是我的服务:

@Injectable()
export class ReadBuchungenService {

    public activeProject : ReplaySubject<any>;
    private get_all_buchungen_url : string = "xxxxxxx/xxx/";


    constructor (private http : Http) {}

    public load(timestamp : number) {
        let params = new URLSearchParams();
        params.set('timestamp', String(timestamp));

        this.http.get(this.get_all_buchungen_url, { search: params })
            .subscribe(res => this.activeProject.next(res));
        return this.activeProject;
    }
}

在 es6 中编译，以下是 package.json 中的依赖项:

"dependencies": {
    "@angular/common": "^2.2.4",
    "@angular/compiler": "^2.1.2",
    "@angular/core": "^2.2.4",
    "@angular/http": "^2.1.4",
    "@angular/platform-browser": "^2.1.2",
    "@angular/platform-browser-dynamic": "^2.1.2",
    "@angular/router": "^3.1.4",
    "core-js": "^2.4.1",
    "reflect-metadata": "^0.1.8",
    "rxjs": "5.0.0-beta.12",
    "systemjs": "^0.19.40",
    "zone.js": "^0.6.26"
  }

谢谢!

现在我尝试设置 ReplaySubject 对象宽度:

public activeProject : ReplaySubject<any> = new ReplaySubject(1);

但随后我得到了一个意外的 token <错误，也是在全新安装 Angular 之后。

完整错误的图像:

Answer 1

您的 activeProject 尚未设置。尝试将其定义为:

public activeProject:ReplaySubject<any> = new ReplaySubject(1);