gistfile1.js

var myString;
var myStringLine;
var thePath = File.openDialog();
//alert(thePath);
   function readPref (thePath) {
      if (File(thePath).exists == true) {
        var file = File(thePath);
        //alert("file :: "+file);
        file.open("r");
        file.encoding= 'BINARY';
        var theText = file.read();
        file.close();
        myString = String(theText).split(",");
        myStringLine = String(theText).split(/\n/g);
        alert('my string line: '+myStringLine);
      }
    };
  var newLine = '\n';
  readPref(thePath);
  for(var i = 0; i < myString.length; i++){
    if (myString[i] == newLine) {
        alert('new line detected');
    }
    alert(myString[i])
  };