​x
 
<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Object.defineProperty()</h2>
​
<p>This example uses the defineProperty() method to add a getter and a setter.</p>
​
<p id="demo"></p>
​
<script>
// Create an object:
const person = {firstName:"John", lastName:"Doe"};
​
// Define a getter
Object.defineProperty(person, "fullName", {
  get: function () {return this.firstName + " " + this.lastName;}
});
​
// Display full name
document.getElementById("demo").innerHTML = person.fullName;
</script>
​
</body>
</html>
​