function createXMLHttpRequest() {
    if (window.ActiveXObject) {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    } 
    else if (window.XMLHttpRequest) {
        xmlHttp = new XMLHttpRequest();
    }
}

function readRSS(url) {
    createXMLHttpRequest();
    xmlHttp.onreadystatechange = handleStateChange;
    xmlHttp.open("GET", url, true);
    xmlHttp.send(null);

  
}

function handleStateChange() {
    if(xmlHttp.readyState == 4) {
        if(xmlHttp.status == 200) {
            ResultSet();
        }
    }
}

function ResultSet() {
    var results = xmlHttp.responseXML;
    var title = null;
    var item = null;
    var link=null;
    //得到channel
    var ccc=results.getElementsByTagName("channel");
     var headtitle=ccc[0].getElementsByTagName("title")[0].firstChild.nodeValue;
     var headlink=ccc[0].getElementsByTagName("link")[0].firstChild.nodeValue;
     var cell = document.createElement("div");
        cell.innerHTML="

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"+headtitle+"

}
function readrss1()
{
    var url=document.getElementById("txturl").value;
    if(url=="")
    {
        alert("请输入RSS地址");
        }
    else
        {
            readRSS(url);
            }
    }

ajax读rss示例