取得DOM物件

function handleStateChange() {
    if(xmlHttp.readyState == 4) {
        if(xmlHttp.status == 200) {
            var xmlDoc = xmlHttp.responseXML; // 取得DOM物件
            var responses = xmlDoc.getElementsByTagName("response");
            var out = "Responses: ";
            for(var i = 0; i < responses.length; i++) {
                var response = responses[i];
                out = out + "<br/><b>" + response.childNodes[0].nodeValue + "</b>";
            }
            document.getElementById("response").innerHTML = out;
        }
    }
}