DOM NamedNodeMap物件length屬性
2019-10-16 23:19:35
length屬性給出此對映中的節點數。有效子節點索引的範圍是0到length-1(包括0和length-1)。
語法
以下是使用length屬性的語法。
nodemapObject.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>
以下範例演示了length 屬性的用法 -
<!DOCTYPE html>
<html>
<meta charset="utf-8"/>
<head></head>
<body>
<script>
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET","/node.xml",false);
xmlhttp.send();
xmlDoc = xmlhttp.responseXML;
x = xmlDoc.getElementsByTagName("Employee");
document.write("長度為 : ");
document.write(x.item(0).attributes.length);
</script>
</body>
</html>
執行上面範例程式碼，得到以下結果 -
