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How to create Object & it's properties, Method in JAVA SCRIPT

CODING:
<!DOCTYPE html>
<html>
<body>

<p>Creating and using an object method.</p>

<p>An object method is a function definition, stored as a property value.</p>
<button onclick="set()">Click ME!</button>
<p id="demo"></p>

<script>
var person = {
    firstName: null,
    lastName : null,
    fullName : function() {
       return this.firstName + " " + this.lastName;
    }
};
function set(){
var f=prompt("Enter Your First Name...");
var l=prompt("Enter Your Last Name...");
person.firstName=f;person.lastName=l;
document.getElementById("demo").innerHTML = person.fullName();
}
</script>
</body>
</html>

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