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<!DOCTYPE html> <html> <body> <p>Click the button to display the 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.indexOf("Apple"); document.getElementById("demo").innerHTML = a; } </script> <p><b>Note:</b> The indexOf method was introduced in JavaScript 1.6, and does not work in Internet Explorer 8 and earlier versions.</p> </body> </html>