Window setInterval() Method

Definition and Usage

The setInterval() method calls a function or evaluates an expression at specified intervals (in milliseconds).
The setInterval() method will continue calling the function until clearInterval() is called, or the window is closed.
The ID value returned by setInterval() is used as the parameter for the clearInterval() method.
Tip: 1000 ms = 1 second.

Syntax

setInterval(code,millisec,lang)

Parameter	Description
code	Required. The function that will be executed
millisec	Required. The intervals (in milliseconds) on how often to execute the code
lang	Optional. JScript | VBScript | JavaScript

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Browser Support

The setInterval() method is supported in all major browsers.

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Example

Example

Call the clock() function every 1000 millisecond. The clock() function updates the clock. The example also have a button to stop the clock: