XML DOM replaceChild() method

Definition and usage

replaceChild() The method replaces the child node with a new node.

The new node can be an existing node in the document or a newly created node.

Tip:The replaced child node can be inserted later into any element in the same document. Please use the insertBefore() or appendChild() method to insert it into the same document later, or use the adoptNode() or importNode() method to insert the replaced node into another document.

Syntax

nodeObject.replaceChild(newchild,oldchild)

Parameters

Technical details

实例

下面的代码将 "books.xml" 加载到 xmlDoc 中，并替换第一个 <book> 元素：

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, newNode, newTitle, newText, xmlDoc, txt;
    xmlDoc = xml.responseXML;
    txt = "";
    x = xmlDoc.documentElement;
    // 创建一个 book 元素、title 元素和一个文本节点
    newNode = xmlDoc.createElement("book");
    newTitle = xmlDoc.createElement("title");
    newText = xmlDoc.createTextNode("Hello World");
    // 将文本节点添加到 title 节点
    newTitle.appendChild(newText);
    // 将 title 节点添加到 book 节点
    newNode.appendChild(newTitle);
    y = xmlDoc.getElementsByTagName("book")[0];
    // 用新的 book 节点替换第一个 book 节点
    x.replaceChild(newNode, y);
    z = xmlDoc.getElementsByTagName("title");
    // 输出所有 title
    for (i = 0; i < z.length; i++) {
        txt += z[i].childNodes[0].nodeValue + "<br>";
    }
    document.getElementById("demo").innerHTML = txt;
}

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Support du navigateur

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