<!DOCTYPE html>
<html>
<body>
<p>Click the button to display the last position of the element "Apple":</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var fruits = ["Banana", "Orange", "Apple", "Mango"];
var a = fruits.lastIndexOf("Apple");
var x = document.getElementById("demo");
x.innerHTML = a;
}
</script>
<p><b>Note:</b>The lastIndexOf method was introduced in JavaScript 1.6, and does not work in Internet Explorer 8 and earlier versions.</p>
</body>
</html>