Remove Duplicate value from textbox by javascript

javascript function

<script type="text/javascript">

function dublicate(control){

   

      var tmipwords = document.getElementById(control).value;

      var arrTracemd = tmipwords.split(/,/);

     

      var arrNewTracemd = [];

      var seenTracemd = {};

      for(var i=0;i<arrTracemd.length;i++)

      {

     

            if (!seenTracemd[arrTracemd[i]])

            {

            seenTracemd[arrTracemd[i]]=true;

            arrNewTracemd.push(arrTracemd[i]);

          }

    }

    var finalv=arrNewTracemd.join(","); 

    document.getElementById(control).value = finalv;

}

</script>

Check button put on html

<asp:TextBox runat="server" ID="txtSkillKeyWord"></asp:TextBox>

(Value should be separate with (,))

<input type="button" onclick="dublicate('txtSkillKeyWord');" value="Check Duplicate">