DOM-節點物件屬性-previousSibling

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屬性 previousSibling 指定緊挨當前節點之前的節點。

語法

以下是previousSibling屬性用法的語法。

nodeObject.previousSibling

示例

node.xml 內容如下所示 −

<?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previousSibling屬性的用法 −

<!DOCTYPE html>
<html>
   <body>
      <script>
         if (window.XMLHttpRequest) {
            xmlhttp = new XMLHttpRequest();
         } else {
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
         }
         xmlhttp.open("GET","/dom/node.xml",false);
         xmlhttp.send();
         xmlDoc = xmlhttp.responseXML;

         function get_previousSibling(p) {
            a = p.previousSibling;
            while (a.nodeType != 1) {
               a = a.previousSibling;
            }
            return a;
         }

         x = get_previousSibling(xmlDoc.getElementsByTagName("Email")[0]);
         document.write("Previous sibling of Email is : ");
         document.write(x.nodeName);
      </script>
   </body>
</html>

執行

將此檔案另存為nodeattribute_previoussibling.htm，放在伺服器路徑中（此檔案和node.xml應該在伺服器中的同一個路徑）。我們將會得到如下所示的輸出 −

Previous sibling of Email is : ContactNo
dom_node_object.htm
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