Script for creating an EAN13 code with correct check digit

ean13-script

function reverse(s)
{
	splitext = s.split("");
	revertext = splitext.reverse();
	reversed = revertext.join("");
	return reversed;
}

function eanCheckDigit(s)
{
	var result = 0;
	var rs = reverse(s);
	for (counter = 0; counter < rs.length; counter++)
	{
		result = result + parseInt(rs.charAt(counter)) * Math.pow(3, ((counter+1) % 2));
	}
	return (10 - (result % 10)) % 10;
}

function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

function generateEan13WithoutCheckDigit() {
    var eanCode = "";
    for(var i=0; i<12; i++){
        eanCode += getRandomInt(0, 9);
    }
    return eanCode;
}

var eanCode = generateEan13WithoutCheckDigit();
prompt("EAN13", eanCode + eanCheckDigit(eanCode));

version-for-browser-shortcut

javascript:(function(){for(var eanCode="",i=0;12>i;i++)eanCode+=Math.floor(10*Math.random());var checkDigit=0,rs=eanCode.split("");for(rs=rs.reverse(),rs=rs.join(""),counter=0;counter<rs.length;counter++)checkDigit+=parseInt(rs.charAt(counter))*Math.pow(3,(counter+1)%2);checkDigit=(10-checkDigit% 10)% 10,prompt("EAN13",eanCode+checkDigit);})();