# delay

**将 `Observable` 的每一个元素拖延一段时间后发出**

![](/files/-MWlwP6PzQ3TY3pPmDJk)

**delay** 操作符将修改一个 `Observable`，它会将 `Observable` 的所有元素都拖延一段设定好的时间， 然后才将它们发送出来。


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