How can I get the user name of a contributor using JavaScript?

Hello,

I am trying to read the owned by attribute using the script to increase the Re Assignment counter when ever a change on the owned by )Assigned by) value is changed. But the function returns me the internal_id of the user_id in the attribute where iam capturing the owned by attribute o/p.

If i would like to convert this internal_id to a string , what is the function to be used ?

Kindly help me out to resolve this issue.

**********************************************Code  Sample*******************************
dojo.provide("com.ibm.team.workitem.hiddenassignee");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");
(function() {
var WorkItemAttributes= com.ibm.team.workitem.api.common.WorkItemAttributes;
   dojo.declare("com.ibm.team.workitem.hiddenassignee", null,  {  

   getValue: function(attributeId, workItem, configuration) {
 
        var hiddenassignee = workItem.getValue(WorkItemAttributes.OWNER);

        console.log("hiddenassignee: assignee is "+hiddenassignee);   
         return hiddenassignee ;
    }
    });
    })();





Thank You..!

Ashwath