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<!DOCTYPE html> <html> <body> <p>Click the button to list all the items in the array.</p> <button onclick="numbers.forEach(myFunction)">Try it</button> <p id="demo"></p> <script> demoP = document.getElementById("demo"); var numbers = [4, 9, 16, 25]; function myFunction(item, index) { demoP.innerHTML = demoP.innerHTML + "index[" + index + "]: " + item + "<br />"; } </script> </body> </html>