switchMap相关文章

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SwitchMap can cancel in-flight network requests.

先引用rxjs官网对SwitchMap的介绍：

每次emission，之前的inner Observable会被cancel，新的Observable会被subscribe.

可以使用"switch to a new Observable"的方法来帮助记忆switchMap的这一特性。

Typeheads

This works perfectly for scenarios like typeaheads where you are no longer concerned with the response of the previous request when a new input arrives.

This also is a safe option in situations where a long lived inner observable could cause memory leaks, for instance if you used mergeMap with an interval and forgot to properly dispose of inner subscriptions. -

Remember, switchMap maintains only one inner subscription at a time, this can be seen clearly in the first example.

Be careful though, you probably want to avoid switchMap in scenarios where every request needs to complete, think writes to a database. switchMap could cancel a request if the source emits quickly enough. In these scenarios mergeMap is the correct option.

看个例子：

源代码：

输出：