window.setInterval

setTimeout — Executes a code snippet or a callable repeatedly, with a fixed time delay between each call.

setInterval(mixed executable, [integer delay, [mixed param, …]])

Name	Description	Type	Optional
executable	Callable name or code snippet.	mixed	No
delay	Number of milliseconds to wait between execution.	integer	Yes
param, …	All following parameters will be passed to the callable.	mixed	Yes

Returns the id of the current interval.

This id can later be used with: clearInterval.

setInterval can run into trouble if delay is too short. See recursive examples in setTimeout for a workaround in these cases.

setInterval(function (param) {
	console.log('Logged every one second.'); // First call is executed after the specified time.
}, 1000);

JavaScript