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<!DOCTYPE html> <html> <body> <p>The toString() method can output numbers as base 16 (hex), base 8 (octal), or base 2 (binary).</p> <p id="demo"></p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var myNumber = 128; document.getElementById("demo").innerHTML = "128 = " + myNumber + " Decimal, " + myNumber.toString(16) + " Hexadecimal, " + myNumber.toString(8) + " Octal, " + myNumber.toString(2) + " Binary." } </script> </body> </html>