in js how to add property in existing object code example

Example 1: how to add property to object in javascript

var data = {
    'PropertyA': 1,
    'PropertyB': 2,
    'PropertyC': 3
};

data["PropertyD"] = 4;

// dialog box with 4 in it
alert(data.PropertyD);
alert(data["PropertyD"]);

Example 2: add property with value in js

var myObject = {
    sProp: 'some string value',
    numProp: 2,
    bProp: false
};