为FireFox的XMLDocument 增加 LoadXML,SelectNodes,SelectSingleNode方法

用惯了IE 的Dom，再来用 FireFox的Dom,感觉真的非常不习惯。连最起码的LoadXML方法都没有。
加入下面的代码，你就可以像在ＩＥ下一样使用XmlDom啦！

 

var infoNodes;
if(document.all)
    infoNodes = document.getElementById("xmlInfo").XMLDocument.documentElement.selectNodes("Product");
else...{
    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";}
       }
    }

    // check for XPath implementation
    if( document.implementation.hasFeature("XPath", "3.0") )
    ...{
       // 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";}
       }
    }

  // 创建 XML 文档对象
  var xmlRef = document.implementation.createDocument("text/xml", "", null);
  // 使用 importNode 将HTML DOM 的一部分转换为XML 文档。 
  // 参数 true 表示克隆全部子元素。
  var myNode = document.getElementById("xmlInfo");
  xmlRef.loadXML(myNode.innerHTML);
  infoNodes = xmlRef.documentElement.childNodes;
}