javascript(자바스크립트) DOM get

<script>
function getSourceAsDOM(url)
{
xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET",url,false);
xmlhttp.send();
parser=new DOMParser();
//return parser.parseFromString(xmlhttp.responseText,"text/html");
var parserDoc = parser.parseFromString(xmlhttp.responseText, "text/html");
return parserDoc.all[0].textContent;
}
console.log(getSourceAsDOM("https://www.cloudflare.com/cdn-cgi/trace"));
</script>
// DOM elementplant로는 html을 받아옴. text만 얻는 방법 찾음.