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<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Functions</h2>
<p>This <strong>apply()</strong> example uses the fullName method of person on myObject:</p>
<p id="demo"></p>
<script>
var person = {
  fullName: function() {
    return this.firstName + " " + this.lastName;
  }
}
var person1 = {
  firstName:"Mary",
  lastName: "Doe",
}
var x = person.fullName.apply(person1); 
document.getElementById("demo").innerHTML = x; 
</script>
</body>
</html>