How to empty input field with jQuery

I am in a mobile app and I use an input field in order user submit a number.

When I go back and return to the page that input field present the latest number input displayed at the input field.

Is there any way to clear the field every time the page load?

$('#shares').keyup(function(){
    payment = 0;
    calcTotal();
    gtotal = ($('#shares').val() * 1) + payment;
    gtotal = gtotal.toFixed(2);
    $("p.total").html("Total Payment: <strong>" + gtotal + "</strong>");
});