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我在Observable中有一个GET请求。我想将它的结果发送给Observer。不幸的是,它发送未定义的值,因为它甚至在GET执行完成之前就与观察者通信 - 这就是问题所在。Rxjs Observable发送undefined - 如何避免它
observer:Observer<any> = {
next: objectFromObservable => { SomeActionWith() }
}
let outputToObserver;
this.http.get(myUrl).map((programs)=>{
const mapped = programs.json() as Program[];
outputToObserver=mapped //here we always have desired object
return mapped;
})
.subscribe(
(res)=>{
return res; //here we always have desired object
}
)
//Here outputToObserver is undefined, so above lines are executed before mapping
let observable:Observable<any> = Observable.create(function (obserwator) {
observer.next(outputToObserver)
它有点难以理解你想用这段代码实现什么。如果你可以指定你的要求,我可以帮助解决这个问题。 –
谢谢,编辑尽我所能。 –