Run JavaScript function at regular time interval

Question

setInterval:

function doSomething() {
    alert('This pops up every 5 seconds and is annoying!');
}

setInterval(doSomething, 5000); // Time in milliseconds

Pass it the function you want called repeatedly every n milliseconds. (setTimeout, by the way, will call a function with a timeout.)

If you ever want to stop the timer, hold onto setInterval’s return value and pass it to clearInterval.