var table = null;
var tbname = null;
var fields = null;
var xmlobject = null;
var fid = null;
var fname = null;
var xmlstring = "<data><table><tbname>abc</tbname><field><fid>fdfd<fid><fname>dfddf</fname></field><field><fid>fdfd<fid><fname>dfddf</fname></field></table>";

xmlstring += "<table><tbname>fgh</tbname><field><fid>dfd<fid><fname>fdf</fname></field></table>";

xmlstring??? +="</data>";
try{
????? if (window.ActiveXObject)
????? {
????????? xmlobject =new ActiveXObject("Microsoft.XMLDOM");
????????? xmlobject.async="false";
????????? xmlobject.loadXML(xmlstring);
????? }

????? // 用于 Mozilla, Firefox, Opera, 等瀏覽器的代碼：
????? else
????? {
???????? var parser=new DOMParser();
???????? xmlobject =parser.parseFromString(xmlstring,"text/xml");
????? }
}catch(e){alert("error");}

var tables = xmlobject.getElementsByTagName("table");
for(var i=0;i<tables.length;i++)
{
??? table = tables.item(i);
??? tbname = table.getElementsByTagName("tbname")[0].firstChild.nodeValue;
????
??? fields = table.getElementsByTagName("field");
??? for(var??? j=0;j<fields.length;j++)
??? {
???? sfield = fields.item(j);
???? fid= sfield.getElementsByTagName("fid")[0].firstChild.nodeValue;
???? fname = sfield.getElementsByTagName("fname")[0].firstChild.nodeValue;
????? }
}