W3Schools Tryit 编辑器 - W3Schools 中文教程

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<!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", "books.xml", true);
xhttp.send();

function myFunction(xml) {
    var x, y, z, i, xLen, yLen, newEle, newText, xmlDoc, txt;
    xmlDoc = xml.responseXML;
    txt = "";
    x = xmlDoc.getElementsByTagName("book");
    xLen = x.length;
    for (i = 0; i < xLen; i++) { 
        newEle = xmlDoc.createElement("edition");
        newText = xmlDoc.createTextNode("first");
        newEle.appendChild(newText);
        x[i].appendChild(newEle);
    }
    // Output all titles and editions
    y = xmlDoc.getElementsByTagName("title");
    yLen = y.length
    z = xmlDoc.getElementsByTagName("edition");
    for (i = 0; i < yLen; i++) { 
        txt += y[i].childNodes[0].nodeValue + 
        " - Edition: " + 
        z[i].childNodes[0].nodeValue + "<br>";
    }
    document.getElementById("demo").innerHTML = txt; 
}
</script>

</body>
</html>