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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<script language="JavaScript" src="js/jquery-1.4.2.min.js"></script>
<title>Untitled Document</title>
<script type="text/javascript">
$(function(){
alert($("#a").find("div:first").attr("id"));
});
</script>
</head>s
<body>
<div id="a">
<div id="123">tttt</div>
<div class="b">aaaa</div>
</div>
</body>
</html>
var idArr = [];
$('div#div2 div').each(function() {
if (!!$(this).attr('id')) {
idArr.push($(this));
}
})
idArr
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>无标题页</title>
<script src="jquery.js" type="text/javascript"></script>
<script type="text/javascript">
$().ready(function(){
$('div#a div[id]').each(function(){
alert(this.id);
});
$('div#a div[class]').each(function(){
alert(this.className);
});
});
</script>
</head>
<body>
<div id="a">
<div id="123"></div>
<div class="b"></div>
<div id="456"></div>
<div class="c"></div>
</div>
</body>
</html>
alert(document.getElementById("a").firstChild.id);
<div id="a">
<div id="123"></div>
<div class="b"></div>
</div>
<input type="text" onkeyup="alert(document.getElementById(this.value).firstChild.id)" />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>无标题页</title>
</head>
<body>
<div id="a">
<div id="123"></div>
<div class="b"></div>
</div>
<input id="txt1" type="text" />
<input type="button" value="取数据" onclick="getvalue();" />
</body>
</html>
<script type="text/javascript">
function getvalue()
{
var id=document.getElementById("txt1").value;
var obj=document.getElementById(id).getElementsByTagName("div");
for(var i=0;i<obj.length;i++)
{
document.write(obj[i].id);
}
}
</script>