<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
myFunction(xhttp);
}
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
var i, x, y, xLen, xmlDoc, txt;
xmlDoc = xml.responseXML;
x = xmlDoc.getElementsByTagName('book');
xLen = x.length;
txt = "";
// Display the value of all "category" attributes
for (i = 0; i < xLen; i++) {
txt += x[i].getAttribute('category') + "<br>";
}
// Remove the value of all "category" attributes
for (i = 0; i <xLen; i++) {
y = x.item(i);
y.removeAttribute('category');
}
// Print the value of all "category" attributes
for (i = 0; i < x.length; i++) {
txt += x[i].getAttribute('category') + "<br>";
}
document.getElementById("demo").innerHTML = txt;
}
</script>
</body>
</html>