angular2类型'主题<{}>'不能分配给'()=>主题<number>'

Question

我使用angular2 rxjs来测试它的多播功能,这是我的代码:

var source = Observable.from([1, 2, 3]);
var subject = new Subject();
var multicasted = source.multicast(subject);

// These are, under the hood, `subject.subscribe({...})`:
multicasted.subscribe({
    next: (v) => console.log('observerA: ' + v)
});
multicasted.subscribe({
    next: (v) => console.log('observerB: ' + v)
});

// This is, under the hood, `source.subscribe(subject)`:
multicasted.connect();

我收到了错误信息:

"Subject <{}>"类型的参数不能分配给类型的参数

'Subject<number> | (() => Subject<number>)'.
        Type 'Subject<{}>' is not assignable to type '() => Subject<number>'.
        Type 'Subject<{}>' provides no match for the signature '(): Subject<number>'

Answer 1

像@yurzui所说,你需要定义泛型主题的类型

var subject = new Subject<number>();