Javascript - done

$.get("myurlhere.php", function() {
    var a = x;
    var b = y;
    $.get("myurlhere.php", {
        valora: a,
        valorb: b
    })
});e usar:
$.get("myurlhere.php", function() {
var a = x;
var b = y;
}).done(function() {
$.get("myurlhere.php", {
valora: a,
valorb: b
})
});