i want to remove double quote from string

var getSelectedPermissionList = function () {
          var allRows = App.grdAdminPermission.getRowsValues();
          var items;
          for (i = 0; i < allRows.length; i++) {
              if (allRows[i].Assigned == true)
                  items = items + allRows[i].ModuleId + ',';
          }
          var item = Ext.encode(items);
          return item;
      };