<html>
<body>
<p id="demo">Click the button to display the last position of the element "Apple":</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var fruits=["Banana","Orange","Apple","Mango","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.</p>
</body>
</html>