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<!DOCTYPE html> <html> <body> <p>Click the button to get multiply every element in the array with a specific number.</p> <p>Multiply with: <input type="number" id="multiplyWith" value="10"></p> <button onclick="numbers.forEach(myFunction)">Try it</button> <p>Updated array: <span id="demo"></span></p> <script> var numbers = [65, 44, 12, 4]; function myFunction(item,index,arr) { arr[index] = item * document.getElementById("multiplyWith").value; demo.innerHTML=numbers; } </script> </body> </html>