<html>
<body>
<p id="demo"></p>
<script>
var person = {
firstName: "John",
lastName : "Doe",
id : 5566,
};
person.name = function() {
return this.firstName + " " + this.lastName;
};
document.getElementById("demo").innerHTML =
"My father is " + person.name();
</script>
</body>
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_object_method_add by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:39:35 GMT -->
</html>