I use javascript in a calculation script in a text field in Nitro PDF. I write this:

var  array = ["randomletters", "randomletters2"];

var text = new String(array[0]);
var result = text.toString();

this.getField("nameofthetextfield").value = result;

It works but the letters appear in a different unicode and incorrect like some other language. I want to use charset utf-8. How can I make the letters appear in the textfield exactly like randomletters?