# shareReplay

**使观察者共享 `Observable`，观察者会立即收到最新的元素，即使这些元素是在订阅前产生的**

![](/files/-MWlwNOa9AlsMSIS6eam)

**shareReplay** 操作符将使得观察者共享源 `Observable`，并且缓存最新的 **n** 个元素，将这些元素直接发送给新的观察者。


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://3440217568.gitbook.io/rxswift/decision_tree/sharereplay.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.