新闻阅读器，responseXML替空

新闻阅读器，responseXML为空
照着书上打得，老是出错，http.responseXML is null,请各路英雄帮忙看看问题出哪

HTML code

<html>
<head>
<script language="javascript" src="rssd.js">
</script>

</head>
<style type="text/css">
.title{
    font:16px bold helvetica,arial,sans-serif;
    padding:0px 30px 0px 30px;
    text-decoration:underline;
}
</style>
<body>
<h3>An Ajax RSS Reader</h3>
<form name="form1">
URL of Rss feed:<input type="text" name="feed" size="50" value="http://">
<input type="button" value="Get Feed" onclick="getRSS()"><br>
<div id="news"><h4>Feed Titles</h4></div>
</form>
</body>

</html>

JScript code

function getXMLHTTPRequest(){
    var request=false;
    try{
        request=new XMLHttpRequest();
       } 
    catch(err1)
    {
    try{
        request=new ActiveXObject("Msxml2.XMLHTTP");
       }
    catch(err2)
    {
    try{
        request=new ActiveXObject("Microsoft.XMLHTTP");
       }
    catch(err3)
       {
        request=false;
       }
    }
    }
    return request;
}

var http=getXMLHTTPRequest();

function getRSS(){
    var myurl='rssproxy.php?feed=';
    var myfeed=document.form1.feed.value;
    myRand=parseInt(Math.random()*999999999);
    var modurl=myurl+escape(myfeed)+"&rand="+myRand;
    http.open("GET",modurl,true);
    http.onreadystatechange=useHttpResponse;
    http.send(null);
}

function useHttpResponse(){
    if(http.readyState==4){
        if(http.status==200){
/*       alert("The server said:"+http.responseText);
}else{
       alert("An error has occurred:"+http.statusText);
}
}

}*/
        while(document.getElementById('news').hasChildNodes())
        {
            document.getElementById('news').removeChild(document.getElementById('news').firstChild);
        }
    
    var titleNodes=http.responseXML.getElementsByTagName("title");
    var descriptionNodes=http.responseXML.getElementsByTagName("description");
    var linkNodes=http.responseXML.getElementsByTagName("link");
    for(var i=1;i<titleNodes.length;i++)
        {
            var newtext=document.createTextNode(titleNodes[i].childNodes[0].nodeValue);
            var newpara=document.createElement('p');
            var para=document.getElementById('news').appendChild(newpara);
            newpara.appendChild(newtext);
            newpara.className="title";
            var newtext2=document.createTextNode(descriptionNodes[i].childNodes[0].nodeValue);
            var newpara2=document.createElement('p');
            var para2=document.getElementById('news').appendChild(newpara2);
            newpara2.appendChild(newtext2);
            newpara2.className="descrip";
            var newtext3=document.createTextNode(linkNodes[i].childNodes[0].nodeValue);
            var newpara3=document.createElement('p');
            var para3=docuement.getElementById('news').appendChild(newpara3);
            newpara3.appendChild(newtext3);
            newpara3.className="link";

        }
    }
 }
}

PHP code

<?php
$mysession=curl_init($_GET['feed']);
curl_setopt($mysession,CURLOPT_HEADER,false);
curl_setopt($mysession,CURLOPT_RETURNTRANSFER,true);
$out=curl_exec($mysession);
header('Content-Type:text/xml');
echo $out;
curl_close($mysession);
?>

------解决方案--------------------
js不能跨域

新闻阅读器，responseXML替空

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