1_greet.js

function Person(){}
Person.prototype.greet = function(){ alert("Hi!"); };

var p = new Person();

JSON.parse(JSON.stringify(p)).greet(); // throws Object #<an Object> has no method 'greet' in Chrome

2_duplicates.js

var a = {"foo": "bar"};
var b = [a, a];
b[0] == b[1] // true
var c = JSON.parse(JSON.stringify(b));
c[0] == c[1] // false

3_proto.js

// Step 1: setup
function Person(){}
Person.prototype.greet = function(){ alert("Hi!"); };

var p = new Person();
p.name = "Bob";

var object = JSON.parse(JSON.stringify(p));
try {
  object.greet(); // still throws exception
} catch(e){
  console.log("error calling #greet, %o", e);
}

// Step 2: change __proto__
object.__proto__ = Person.prototype;

// Step 3: verify
object.greet(); // now it works!

3b_ie_proto.js

// Step 1: same as before

// Step 2: copy properties
var tmp = function(){};
tmp.prototype = Person.prototype;
tmp.prototype.constructor = Person;
var t = new tmp;
for (k in object) {
  t[k] = object[k];
}
object = t;
// not that it matters, but object.constructor == Person now.  A good thing, so you can reserialize easily.

// Step 3: verify
object.greet(); // now it works!
object instanceof Person // this is also true