---
title: Window setInterval Method
---
## Window setInterval Method
The `setInterval()` method calls a function or evaluates an expression at specified intervals (in milliseconds).
```js
setInterval(function(){ alert("Hello"); }, 3000);
```
The `setInterval()` method will continue calling the function until `clearInterval()` is called, or the window is closed.
The `setInterval()` method can pass additional parameters to the function, as shown in the example below.
```js
setInterval(function, milliseconds, parameter1, parameter2, parameter3);
```
The ID value returned by `setInterval()` is used as the parameter for the `clearInterval()` method.
Tips:
* 1000 ms = 1 second.
* To execute a function only once, after a specified number of milliseconds, use the `setTimeout()` method.
#### More Information:
Documentation: MDN
JavaScript setInterval() Function Examples: Sitepoint
and some more examples: w3schools