W3Schools Tryit 编辑器 - W3Schools 中文教程

<!DOCTYPE html>
<html>
<body>

function myFunction(xml) {
    var x, y, z, i, newNode, newTitle, newText, xmlDoc, txt;
    xmlDoc = xml.responseXML;
    txt = "";
    x = xmlDoc.documentElement;
    
    // Create a book element, title element and a text node
    newNode = xmlDoc.createElement("book");
    newTitle = xmlDoc.createElement("title");
    newText = xmlDoc.createTextNode("A Notebook");

// Add a text node to the title node
    newTitle.appendChild(newText);

// Add the title node to the book node
    newNode.appendChild(newTitle);

y = xmlDoc.getElementsByTagName("book")[0];

// Replace the first book node with the new book node
    x.replaceChild(newNode, y);

z = xmlDoc.getElementsByTagName("title");
    // Output all titles  
    for (i = 0; i < z.length; i++) { 
        txt += z[i].childNodes[0].nodeValue + "<br>";
    }
    document.getElementById("demo").innerHTML = txt; 
}
</script>

</body>
</html>