JavaScript - Countdown

by katalin_2003

HTML

<span id="timer"></span>

JavaScript

var count = 30;

var counter = setInterval(timer, 1000); //1000 will  run it every 1 second

function timer() {
    count = count - 1;
    if (count < 0) {
        clearInterval(counter);
        return;
    }

    document.getElementById("timer").innerHTML = count + " secs"; // watch for spelling
}