function splitString (targetString,separator1,separator2) {

    console.log('TargetString: "' + targetString + '"');
    console.log('Separator1: "' + separator1 + '"');
    console.log('Separator1: "' + separator2 + '"');

    var arrayOfStrings = targetString.split(separator1);
    var tmpMap = new Map();
    //for (var i = 0; i < arrayOfStrings.length; i++) {
    //    var splitBycolon = arrayOfStrings[i].split(separator2);
    //    tmpMap.set(splitBycolon[0],splitBycolon[1]);
    //}
    //arrayOfStrings.forEach(function(val, i) {
    //    console.log(i);
    arrayOfStrings.forEach(function(val) {
        var splitBycolon = val.split(separator2);
        tmpMap.set(splitBycolon[0],splitBycolon[1]);
    });
    return tmpMap;
}

var originalString = "user1:pass1,user2:pass2,user3:pass3";
var comma = ",";
var colon= ":";
var mapOfStrings = splitString(originalString,comma,colon);
//for (var key of mapOfStrings.keys()) {
//  console.log("user : " + key + ", pass : " +  mapOfStrings.get(key));
//}

console.log("---------");
mapOfStrings.forEach(function(val, key) {
  console.log(key, val);
});