angular2类型'Subject<{}>‘不能指定为'() => Subject<number>’

Question

我使用angular2 rxjs测试它的多播功能，下面是我的代码：

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();

我得到了错误信息：

类型'Subject<{}>‘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

就像@yurzui说的，您需要定义泛型主题的类型

var subject = new Subject<number>();