DOM Attribute物件specified屬性
2019-10-16 23:18:51
DOM Attribute物件specified屬性是一個布林值，如果文件中存在屬性值，則返回true。
語法
以下是使用specified屬性的語法。
attrObject.specified
範例
檔案：node.xml 的內容如下 -
<?xml version = "1.0"?>
<Company>
<Employee category = "Technical">
<FirstName>Tianya</FirstName>
<LastName>Su</LastName>
<ContactNo>0898-12345678</ContactNo>
<Email>[email protected]</Email>
</Employee>
<Employee category = "Non-Technical">
<FirstName>Max</FirstName>
<LastName>Lee</LastName>
<ContactNo>089833990088</ContactNo>
<Email>[email protected]</Email>
</Employee>
<Employee category = "Management">
<FirstName>Susen</FirstName>
<LastName>Wong</LastName>
<ContactNo>1010-234562350</ContactNo>
<Email>[email protected]</Email>
</Employee>
</Company>
以下範例演示了specified屬性的用法 -
<!DOCTYPE html>
<html>
<meta charset="utf-8"/>
<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("/node.xml");
x = xmlDoc.getElementsByTagName('Employee');
document.write("如果屬性存在則為true，否則為false : ");
document.write(x.item(0).attributes[0].specified);
</script>
</body>
</html>
執行上面範例程式碼，得到以下結果 -
