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47 lines (38 loc) · 981 Bytes
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properties.js
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47 lines (38 loc) · 981 Bytes
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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);