Angular rxjs 订阅

Question

这个问题已经有答案了:

Property '...' has no initializer and is not definitely assigned in the constructor (37 个回答)

已关闭 2 年前。

我在 Angular 中声明订阅，如下所示:

counterSubscription: Subscription

它给了我这个错误:

Property 'counterSubscription' has no initializer and is not definitely assigned in the constructor.

那么 Subscription 的初始值可能是多少？请问？

Answer 1

如果您要在 Angular 生命周期 Hook (例如 ngOnInit)中初始化订阅，则可以使用 Definite Assignment Assertion Operator ! 通知 TypeScript 该变量将被初始化。

counterSubscription!: Subscription;