<html>?? ?<head>?? ??? ?<title>Document</title>?? ??? ?<style type="text/css">?? ??? ?</style>?? ?</head>?? ?<body>?? ??? ?<ul id="ulid">?? ??? ???? <li id="li1">是是是</li>?? ??? ??? ?<li id="li2">ddd</li>?? ??? ??? ?<li id="li3">發(fā)發(fā)發(fā)</li>?? ??? ?</ul>?? ?</body>?? ?<script type="text/javascript">?? ??? ?//獲取父節(jié)點?? ??? ?var li = document.getElementById("li2");?? ??? ?var ul = li.parentNode;?? ??? ?//獲取第一個子節(jié)點??????? alert(ul.firstChild.id);?? ?</script></html>
各位大神求助，關(guān)于JavaScript的firstChild為什么在火狐上出現(xiàn)的值是undefinde！
xiedukai
2015-09-27 23:33:26