typescript 泛型类型 Subject<T> 需要 1 个类型参数。- 角
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Generic type Subject<T> requires 1 type argument(s). - Angular
提问by Roxy'Pro
I'm getting data from my service and I've red about it's important to unsubscribe after subscribe, and here is how I did it :
我正在从我的服务中获取数据，并且我已经意识到在订阅后取消订阅很重要，我是这样做的：
export class RItemComponent implements OnInit {
apiPath = environment.apiUrl;
private ngUnsubscribe: Subject = new Subject();
constructor(private _sharedService: SharedService) { }
rItems: Product[];
ngOnInit() {
this._sharedService.
getReceiptItem().takeUntil(this.ngUnsubscribe).
subscribe(products => this.rItems = products);
}
ngOnDestroy() {
this.ngUnsubscribe.next();
this.ngUnsubscribe.complete();
}
}
But now I'm getting an error:
但现在我收到一个错误：
Generic type Subject requires 1 type argument(s). subscribe
通用类型主题需要 1 个类型参数。订阅
I don't understand why?
我不明白为什么？
Any kind of help would be awesome, thanks!
任何形式的帮助都会很棒，谢谢！
回答by Sachila Ranawaka
Add a generic type for subject
为主题添加通用类型
private ngUnsubscribe: Subject<any> = new Subject();
回答by ggradnig
The Subjectclass has a generic type parameter in TypeScript. This means, that instances of this class can only be created by passing an additional type parameter, like this:
该Subject班有一个打字稿泛型类型参数。这意味着，此类的实例只能通过传递额外的类型参数来创建，如下所示：
private ngUnsubscribe: Subject<MyClass> = new Subject();
