DOM - Node 节点对象方法 - replaceChild

方法 replaceChild 用于用新节点替换旧子节点。这将返回替换的节点。

语法

以下是使用 replaceChild 方法的语法。

nodeObject.replaceChild(Node newChild, Node oldChild)

此方法返回被替换的节点。

示例

node.xml内容如下 −

<?xml version = "1.0"?>
<Company>
   <Employee category = "Technical">
      <FirstName>Tanmay</FirstName>
      <LastName>Patil</LastName>
      <ContactNo>1234567890</ContactNo>
      <Email>tanmaypatil@xyz.com</Email>
   </Employee>
   
   <Employee category = "Non-Technical">
      <FirstName>Taniya</FirstName>
      <LastName>Mishra</LastName>
      <ContactNo>1234667898</ContactNo>
      <Email>taniyamishra@xyz.com</Email>
   </Employee>
   
   <Employee category = "Management">
      <FirstName>Tanisha</FirstName>
      <LastName>Sharma</LastName>
      <ContactNo>1234562350</ContactNo>
      <Email>tanishasharma@xyz.com</Email>
   </Employee>
</Company>

以下示例演示了 replaceChild 方法的用法 −

<!DOCTYPE html>
<html>
   <head>
      <script>
         function loadXMLDoc(filename) {
            if (window.XMLHttpRequest) {
               xhttp = new XMLHttpRequest();
            } else // code for IE5 and IE6 {
               xhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xhttp.open("GET",filename,false);
            xhttp.send();
            return xhttp.responseXML;
         }
      </script>
   </head>
   <body>
      <script>
         xmlDoc = loadXMLDoc("/dom/node.xml");

         x = xmlDoc.documentElement;

         create_e1 = xmlDoc.createElement("Employee");
         create_e2 = xmlDoc.createElement("Email");
         create_t = xmlDoc.createTextNode("tanu@xyz.com");

         create_e2.appendChild(create_t);
         create_e1.appendChild(create_e2);

         y = xmlDoc.getElementsByTagName("Employee")[0]
         x.replaceChild(create_e1,y);

         z = xmlDoc.getElementsByTagName("Email")[0];
         document.write("After Replacement  : ")
         document.write(z.childNodes[0].nodeValue);

      </script>
   </body>
</html>

执行

将此文件另存为 nodemethod_replacechild.htm 并保存在服务器路径上(此文件和 node.xml 应位于您服务器中的同一路径上)。我们将获得如下所示的输出 −

After Replacement : tanu@xyz.com