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<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>