Edit in JSFiddle

var person = {
  name: "sin",
  friends: ["lee", "park"]
};

var person1 = Object.create(person);
person1.name = "choi";
person1.friends.push("yoon");
document.write(person1.name + "<br>"); // choi

var person2 = Object.create(person, {
  name: {
    value: "kim"
  }
});

person2.friends.push("hong");
document.write(person2.name + "<br>"); // kim

document.write(person.friends); // lee,park,yoon,hong