How do you create a function that is attatched to an object like in the example document.write();

Answer 1

Ver obj;
Obj.func = function() {}

Answer 2

1.
var obj = {};
obj.func = function() {}

2.
function Fruits(){}
Fruits.prototype.getFruitsA = function(){}
var fruits = new Fruits();
fruits.getFruitsB = function(){}
getFruitsA();
getFruitsB();