10 Second Countdown in jquery

var counter = 10;
setInterval(function() {
    counter--;
    if (counter >= 0) {
        span = document.getElementById("count");
        span.innerHTML = counter;
    }
    // Display 'counter' wherever you want to display it.
    if (counter === 0) {
        get_location(); // write ajax code here
        counter = 10;
        //clearInterval(counter); //to stop recount down uncomment this line code
    }
}, 1000);


<div data-role="fieldcontain">
         <h3>Next Update in <span id="count"></span> secs</h3>
</div>