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<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Objects</h2>
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<p>You cannot add a new property to a constructor function.</p>
​
<p id="demo"></p>
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<script>
function Person(first, last, age, eye) {
  this.firstName = first;
  this.lastName = last;
  this.age = age;
  this.eyeColor = eye;
}
​
Person.nationality = "English";
​
const myFather = new Person("John", "Doe", 50, "blue");
const myMother = new Person("Sally", "Rally", 48, "green");
​
document.getElementById("demo").innerHTML =
"The nationality of my father is " + myFather.nationality; 
</script>
​
</body>
</html>
​