Help please.not working.

Question

function getTotal(a,b){
this.x= a;
this.y= b;
this.z = function (){
return this.x + this.y;
}
}
var obj1 = new getTotal(2,23);
document.write(z());

Answer 1

obj1.z()

Answer 2

Thanks.
I want output .how?
var myObject = {
firstName:"John",
lastName: "Doe",
fullName: function() {
return this;
}
}
document.getElementById("demo").innerHTML = myObject.fullName();

Answer 3

return this.firstName+' '+this.lastName;

... but that's not a reason to not follow Martin Taylor advice ;P

Answer 4

Thanks All.