> For the complete documentation index, see [llms.txt](https://3440217568.gitbook.io/rxswift/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://3440217568.gitbook.io/rxswift/decision_tree/interval.md).

# interval

**创建一个 `Observable` 每隔一段时间，发出一个索引数**

![](https://4217506537-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MWj545abP2yK86-qksJ%2Fsync%2F0712963ace39557988c0cf4cb6100e212e5411c4.png?generation=1616819389620739\&alt=media)

**interval** 操作符将创建一个 `Observable`，它每隔一段设定的时间，发出一个索引数的元素。它将发出无数个元素。