​x
 
<!DOCTYPE html>
<html>
<body>
​
<p id="demo"></p>
​
<script>
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        myFunction(this);
    }
};
xhttp.open("GET", "/demo/xml/books.xml", true);
xhttp.send();
​
function myFunction(xml) {
    var x, newatt, xmlDoc;
    xmlDoc = xml.responseXML;
    newatt = xmlDoc.createAttribute("edition");
    newatt.nodeValue = "第一版";
    x = xmlDoc.getElementsByTagName("title");
    x[0].setAttributeNode(newatt);
    document.getElementById("demo").innerHTML =
    "Edition: " + x[0].getAttribute("edition");
}
</script>
​
</body>
</html>
​