<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
.cc{ background:#F00; height:300px; width:500px;}
</style>
</head>
<body>
<div id="div1"><div id="1" class="">1</div><div id="1">2</div><div id="1">3</div><div id="1"></div></div>
</body>
</html>
<script type="text/javascript">
var oDiv=document.getElementById("div1").getElementsByTagName("div")
function fn(oDiv){
var a=[]
for(var i=0;i<oDiv.length;i++){
if(oDiv.item(i)&&oDiv.item(i).nodeType&&oDiv.item(i).nodeType===1){
a.push(oDiv.item(i))
}
}
//return a;
return a
}
var s = fn(oDiv)
alert(s[0])
s[0].className='cc';
</script>
