Об'єкт

var person = new Object();

person.firstName = "John";

person.lastName = "Doe";

person.age = 50;

person.eyeColor = "blue"; 

document.getElementById("demo").innerHTML =

person.firstName + " is " + person.age + " years old.";

// Constructor function for Person objects

function Person(first, last, age, eye) {

    this.firstName = first;

    this.lastName = last;

    this.age = age;

    this.eyeColor = eye;

}

// Create a Person object

var myFather = new Person("John", "Doe", 50, "blue");

// Display age

document.getElementById("demo").innerHTML =

"My father is " + myFather.age + ".";     // myFather["age"]

var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}

var x = person;

x.age = 10;  // 50->10

document.getElementById("demo").innerHTML =

person.firstName + " is " + person.age + " years old.";