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function Employee(age)

{

this.age = age;

}

var employee = new Employee(50);

// Nothing stops you from assigning a value of 1000 to age field

employee.age = 1000;

// the example below is read-only property and age is read/write property.

function Employee(name, age)

{

var _name = name;

var _age = age;

Object.defineProperty(this, "age",

{

get: function () { return _age; },

set: function (value)

{

if (value > 100 || value < 1)

{

alert("Invalid age");

}

else

{

_age = value;

}

}

});

Object.defineProperty(this, "name",

{

get: function () { return _name; }

});

}

var employee = new Employee("Tom", 55);

// Cannot change the value of name property (read-only)

employee.name = "Tommy";

// Will alert an error - Invalid age

employee.age = 195;

document.write(employee.name + " " + employee.age);