我一直在拔头发。有没有人想出下面的Angular 2打字稿代码块中订阅者的类型?
let obs: Observable<string> = Observable.create((subscriber) => { ... })
答案 0 :(得分:8)
创建用于创建具有自定义订阅行为的Observables
。
传递给Observable.create
方法的函数定义了Observable订阅时应该发生的行为。因此,传入的subscriber
将是实现Observer<T>
接口的对象。
例如,以下代码将创建Observable
,当订阅时,将发出两个值然后完成(对于任何语法错误提前道歉,我不使用TypeScript):
let obs: Observable<string> = Observable.create((subscriber) => {
subscriber.next("Hello");
subscriber.next("World!");
subscriber.complete();
});
//Here is a subscriber that we define to subscribe to the Observable
let sub: Subscriber<string> = Subscriber.create(
(x) => console.log(x),
null,
() => console.log("Done"));
//At this point the method you passed to Observable.create will be invoked
obs.subscribe(sub);
//Output:
//Hello
//World!
//Done
请注意,这实际上不会执行此代码,而是定义当新订阅者通过调用订阅时将遵循的行为
obs.subscribe(subscriber)
或者有一个功能:
obs.subscribe((x) => console.log(x);
在许多情况下,不需要使用create
,因为大多数常见事件排放源都有包装,所以你没有
答案 1 :(得分:1)
有没有人想出订户在下面的Angular 2打字稿代码块中的类型
只要next
值可用,它就是onNext
值。请参阅:http://reactivex.io/documentation/operators/create.html (subscriber)=>
是函数(next)=>
。我个人称之为[...]
Application.ScreenUpdating = False
Application.DisplayStatusBar = True
Dim i As Integer
For i = 2 To Sheets.Count ' example from my macro but you could use any repeating process
Worksheets(i).Activate
Application.StatusBar = "Updating Filings for " & ( i - 1 ) & " of " & (Sheets.Count - 1) & " | " & Format (( i - 1 )) / (Sheets.Count - 1), "0%") & "Complete"
Next i
Application.StatusBar = ""
Application.DisplayStatusBar = False
[...]