firefox chrome ie9,10,11 不支持selectSingleNode和selectNodes的解决方法

firefox并不支持selectSingleNode和selectNodes的解决方法

function test(){

         var perid = document.thisForm.PerID.value;

         var xml="test";

         if(window.ActiveXObject){

             var xml=new ActiveXObject("Microsoft.XMLDOM");

             xml.async=false;

             xml.load("xxxx.xml");

         }else if((typeof document.implementation != 'undefined')&&

             (typeof document.implementation.createDocument!='undefined')){

             xml = document.implementation.createDocument("", "", null);

             xml.async=false;

             xml.load("xxxx.xml");

            //firefox并不支持selectSingleNode和selectNodes方法;下面两段是用XPath来解决firefox模拟selectSingleNode和selectNodes方法,正确性有待解决

             XMLDocument.prototype.selectSingleNode = Element.prototype.selectSingleNode = function (xpath){

                  var   x = this .selectNodes(xpath)

                 if ( ! x || x.length < 1 ) return   null ;

                 return   x[ 0 ];

             }

             XMLDocument.prototype.selectNodes = Element.prototype.selectNodes = function (xpath){

                  var   xpe   =   new   XPathEvaluator();

                  var   nsResolver   =   xpe.createNSResolver( this .ownerDocument   ==   null    ?

                     this .documentElement :  this .ownerDocument.documentElement);

                  var   result   =   xpe.evaluate(xpath,  this , nsResolver,  0 ,  null );

                  var   found   =   [];

                  var   res;

                 while   (res   =   result.iterateNext())

                     found.push(res);

                 return   found;

             }

         }

        //下面就可以用selectSingleNode和selectNodes方法

         var row=null;

        if(perid.substring(0,5)=="NO" &&　perid.length==9){

             row=xml.selectSingleNode("root/row[@ID='"+perid+"']");

            if (row!=null){

                 document.thisForm.MenuColor.value=row.getAttribute("CssFileName");

                 ChangeBgColor(document.thisForm.MenuColor.value);

             }

         }

     }