返回到：Prototype – 元素对象
此方法返回作为元素的第一个子元素。这与firstChild DOM 属性相反，它将返回任何节点。
语法
element.firstDescendant();
返回值
它返回一个 HTML 元素。
例子
HTML
x
28
28
1
<html>2
<head>3
<title>Prototype examples</title>4
<script type = "text/javascript" src = "/javascript/prototype.js"></script>5
6
<script>7
function showResult() {8
desc = $('grandfather').firstDescendant();9
alert("First Descendant is : " + desc.nodeName + ':' + desc.innerHTML );10
child = $('grandfather').firstChild;11
alert("First Child is : " + child.toString() );12
}13
</script>14
</head>15
16
<body>17
<p>Click the button to see the result.</p>18
19
<div id = "grandfather">This is grand father20
<div id = "father"> This is father.21
<div id = "kid">This is kid</div>22
</div>23
</div>24
<br />25
26
<input type = "button" value = "showResult" onclick = "showResult();"/>27
</body>28
</html>返回到：Prototype – 元素对象
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作者：terry，如若转载，请注明出处：https://www.web176.com/prototype_api/9111.html
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