jQuery fn.extend demo

HTML

<div id="result" style="border: 1px solid black; min-width: 20px; min-height: 20px;"></div>

JavaScript

var a = { x: 1, y: 2 };
var b = { y: 0, z: 3 };
var c = $.extend({}, a, b);

$(function () {
    $('#result').text(JSON.stringify(c, null, 2));
});