js IE,Mozilla,Firefox,Opera浏览器 xml方法

 

function GetNodeValue(obj)

{

var str = "";

if(window.ActiveXObject)    //IE

{

  str = obj.text;

}

else //Mozilla

{

  try

  {

   str = obj.childNodes[0].nodeValue;

  }

  catch(ex)

  {

   str = "";

  }

}

return str;

}

if(document.implementation && document.implementation.createDocument)

{

XMLDocument.prototype.loadXML = function(xmlString)

{

  var childNodes = this.childNodes;

  for (var i = childNodes.length - 1; i >= 0; i--)

   this.removeChild(childNodes[i]);

  var dp = new DOMParser();

  var newDOM = dp.parseFromString(xmlString, "text/xml");

  var newElt = this.importNode(newDOM.documentElement, true);

  this.appendChild(newElt);

};

// check for XPath implementation

if( document.implementation.hasFeature("XPath", "3.0") )

{

    // prototying the XMLDocument

    XMLDocument.prototype.selectNodes = function(cXPathString, xNode)

    {

    

    if( !xNode ) { xNode = this; }

    var oNSResolver = this.createNSResolver(this.documentElement)

    var aItems = this.evaluate(cXPathString, xNode, oNSResolver,

        XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null)

    var aResult = [];

    for( var i = 0; i < aItems.snapshotLength; i++)

    {

    aResult[i] =  aItems.snapshotItem(i);

    }

    return aResult;

    }

    // prototying the Element

    Element.prototype.selectNodes = function(cXPathString)

    {

    if(this.ownerDocument.selectNodes)

    {

    return this.ownerDocument.selectNodes(cXPathString, this);

    }

    else{throw "For XML Elements Only";}

    }

}

  // prototying the XMLDocument

    XMLDocument.prototype.selectSingleNode = function(cXPathString, xNode)

    {

    if( !xNode ) { xNode = this; }

    var xItems = this.selectNodes(cXPathString, xNode);

    if( xItems.length > 0 )

    {

    return xItems[0];

    }

    else

    {

    return null;

    }

    }

    

    // prototying the Element

    Element.prototype.selectSingleNode = function(cXPathString)

    {    

    if(this.ownerDocument.selectSingleNode)

    {

    return this.ownerDocument.selectSingleNode(cXPathString, this);

    }

    else{throw "For XML Elements Only";}

    }

}