# timeout

**如果源 `Observable` 在规定时间内没有发出任何元素，就产生一个超时的 `error` 事件**

![](/files/-MWlwPGcCSqwofG9Pogs)

如果 `Observable` 在一段时间内没有产生元素，**timeout** 操作符将使它发出一个 `error` 事件。


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