I'm JUST starting to learn about E4X and creating XML Documents with javascript.  I have been using examples found online to experiment with a simple SuiteLet.

Here is the code:

 var AvailableSNRequestHandler =  {      /**       * @param {nlobjRequest} request       * @param {nlobjResponse} response       */      Execute: function ASNRH_execute(request, response)      {          var xml = new XML();                    xml =              <order>                  <date>2005-08-01</date>                  <customer>                     <firstname>John</firstname>                     <lastname>Johnson</lastname>                  </customer>                  <item>                     <name>Maxilaku</name>                     <qty>5</qty>                     <price>155.00</price>                  </item>              </order>;                        var txt = nlapiXMLToString(xml);          response.write(txt);      },    }