javascript读取xml

<script language=javascript>
            var orderDoc=new ActiveXObject("MSXML2.DOMDocument.3.0");
            orderDoc.async=false;
            orderDoc.load("xml.xml");
            var items=orderDoc.selectNodes("/PolicyList/Policy/PrimaryNo");
            var items1=orderDoc.selectNodes("/PolicyList/Policy/Insurance");
            var PrimaryNo="",Insurance="";
            for(var i=0;i<items.length;i++)
            ...{
                PrimaryNo=items[i].text;
                Insurance=items1[i].text;
            }
            function ReadXml(doc,xpath)
            ...{
                var retval="";
                var value=doc.documentElement.selectSingleNode(xpath)
                if(value)retval=value.text;
                return retval;
            }
            </script>

<?xml version='1.0' encoding='GB2312'?>
<PolicyList username="YLQ">

<Policy BusinessLogic="AddFreightPolicyWeb" >
<!--ID值 -->
<PrimaryNo>20051011</PrimaryNo>
<!--险种名称 -->
<Insurance>国内货物运输保险111 </Insurance>
</Policy>

<Policy BusinessLogic="AddFreightPolicyWeb" >
<!--ID值 -->
<PrimaryNo>20051012</PrimaryNo>
<!--险种名称 -->
<Insurance>国内货物运输保险222 </Insurance>
</Policy>
</PolicyList>