DOM NodeList物件length
屬性給出節點列表中的節點數。
語法
以下是使用length
屬性的語法。
nodelistObject.length
範例
檔案:node.xml 的內容如下 -
<Company>
<Employee category = "Technical" id = "firstelement">
<FirstName>Susen</FirstName>
<LastName>Su</LastName>
<ContactNo>1584567890</ContactNo>
<Email>[email protected]</Email>
</Employee>
<Employee category = "Non-Technical">
<FirstName>Max</FirstName>
<LastName>Su</LastName>
<ContactNo>1334667898</ContactNo>
<Email>[email protected]</Email>
</Employee>
<Employee category = "Management">
<FirstName>Min</FirstName>
<LastName>Su</LastName>
<ContactNo>1364562350</ContactNo>
<Email>[email protected]</Email>
</Employee>
</Company>
以下範例將XML文件(node.xml)解析為XML DOM物件,並使用length
屬性提取長度資訊。
檔案:lenght.html -
<!DOCTYPE html>
<html>
<meta charset="utf-8"/>
<head></head>
<body>
<script>
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET","/node_.xml",false);
xmlhttp.send();
xmlDoc = xmlhttp.responseXML;
y = xmlDoc.getElementsByTagName('FirstName');
document.write("Length of node list: " + y.length);
</script>
</body>
</html>
執行上面範例程式碼,得到以下結果 -