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<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Object Constructors</h2>
​
<p id="demo"></p>
​
<script>
// Constructor function for Person objects
function Person(firstName,lastName,age,eyeColor) {
  this.firstName = firstName;
  this.lastName = lastName;
  this.age = age;
  this.eyeColor = eyeColor;
  this.changeName = function (name) {
    this.lastName = name;
  }
}
// Create a Person object
const myMother = new Person("Sally","Rally",48,"green");
​
// Change last name
myMother.changeName("Doe");
​
// Display last name
document.getElementById("demo").innerHTML =
"My mother's last name is " + myMother.lastName;
</script>
​
</body>
</html>
​