nomer apalah

<script type="text/javascript">

function checkNumber () {
var n = prompt("Enter a number", "5");
var entered = "You entered a number between";

if (n >= 1 && n < 10)                  
  {alert(entered + " 0 and 10")}
else if (n >= 10 && n < 20)
  {alert(entered + " 9 and 20")}
else if (n >= 20 && n < 30)
  {alert(entered + " 19 and 30")}
else if (n >= 30 && n < 40)
  {alert(entered + " 29 and 40")}
else if (n >= 40 && n <= 100)
  {alert(entered + " 39 and 100")}
else if (n < 1 || n > 100)
  {alert("You entered a number less than 1 or greater than 100")}
else
  {alert("You did not enter a number!")}
}

</script> 

hasilnya