js操作dom（4）关于xml节点属性的操作

Code

        function test()
        {
            var doc= new ActiveXObject("Microsoft.XMLDOM");

            //var doc=sg.xmlDocument();
            var returnXml="<Root></Root>"; 
            doc.loadXML(returnXml);
      
            var r=doc.selectSingleNode("Root");

            //r.attributes.removeNamedItem("Caption"); //移除单个节点
            for(var i=0;i<5;i++)
            {
                r.setAttribute("attr"+i,i);
            }
            
            for(var i=0,j=r.attributes.length;i<j;i++)
            {
                alert(r.attributes[i].value);
            }

            removeAttributes(r);
            //removeAttributes(r,1,10000);

            for(var i=0,j=r.attributes.length;i<j;i++)
            {
                alert(r.attributes[i].value);
            }
            
    
        //移除所有节点，或者某个范围的节点
        function removeAttributes(node,from,to)
        {
            if (from==null || to==null)
            {
                for(var i=0,j=node.attributes.length;i<j;i++)
                {
                    var attrName=node.attributes[0].name;
                    node.attributes.removeNamedItem(attrName);
                }    
            }
            else if(from != null && to != null)
            {
                var len=node.attributes.length>to?to:node.attributes.length;
                for(var i=from;i<len;i++)
                {
                    var attrName=node.attributes[from].name;
                    node.attributes.removeNamedItem(attrName);
                }    
            }
        }