# buffer

**缓存元素，然后将缓存的元素集合，周期性的发出来**

![](/files/-MWlwN8-KHKmEyGs1fn8)

**buffer** 操作符将缓存 `Observable` 中发出的新元素，当元素达到某个数量，或者经过了特定的时间，它就会将这个元素集合发送出来。


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