# window

**将 `Observable` 分解为多个子 `Observable`，周期性的将子 `Observable` 发出来**

![](/files/-MWlwQLdYij6Wl43iWTd)

**window** 操作符和 [buffer](/rxswift/decision_tree/buffer.md) 十分相似，[buffer](/rxswift/decision_tree/buffer.md) 周期性的将缓存的元素集合发送出来，而 **window** 周期性的将元素集合以 `Observable` 的形态发送出来。

[buffer](/rxswift/decision_tree/buffer.md) 要等到元素搜集完毕后，才会发出元素序列。而 **window** 可以实时发出元素序列。


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