angular2 类型 'Subject<{}>' 不可分配给类型 '() => Subject<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();

我得到了错误信息：

'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

就像@yurzui 说的，你需要定义泛型 Subject 的类型

var subject = new Subject<number>();

angular2 类型 'Subject<{}>' 不可分配给类型 '() => Subject<number>'

angular2 Type 'Subject<{}>' is not assignable to type '() => Subject<number>'

multicast

rxjs

typescript

angular