XML DOM replaceData() Method

Comment 对象

Definition and Usage

replaceData() Method to replace data in comment nodes.

Syntax

commentNode.replaceData(start,length,string)
Parameters Description
start Required. Specifies the position at which to start replacing characters. The starting value is zero.
length Required. Specifies the number of characters to be replaced.
string Required. Specifies the string to be inserted.

Example

The following code loads "books_comment.xml" into xmlDoc and replaces "Simple" with "Easy" in the comment node of the first <book> element:

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
   if (this.readyState == 4 && this.status == 200) {
       myFunction(this);
   }
};
xhttp.open("GET", "books_comment.xml", true);
xhttp.send();
function myFunction(xml) {
    var x, i, txt, xmlDoc;
    xmlDoc = xml.responseXML;
   txt = "";
    x = xmlDoc.getElementsByTagName("book")[0].childNodes;
    for (i = 0; i < x.length; i++) {
    // Process only comment nodes
        if (x[i].nodeType == 8) {
            x[i].replaceData(4, 6, "Easy");
            txt += x[i].data + "<br>";
        }
    }
    document.getElementById("demo").innerHTML = txt;
}

亲自试一试

在上面的例子中，我们用了循环和 if 测试语句，来确保我们只处理注释节点。注释节点的节点类型为 8。

Comment 对象