gistfile1.js

function fnHitung() {
    var angka = document.getElementById('inputku').value;
    if (document.getElementById('inputku').value == "") {
        alert("Jangan Dikosongi");
        document.getElementById('inputku').focus();
        return false;
    }
    else
        if (angka >= 1) {
          var hasil;
          hasil = angka*0.6;
          alert(angka+" Mil = "+hasil+" Kilometer");
        document.getElementById('inputku').focus();
        document.getElementById('inputku').value = tandaPemisahTitik(angka) ;
        return false; 
        }
}