overflow的属性

<!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>
</head>
<script type="text/javascript" src="docs.js"></script>
<script type="text/javascript">
var b=true;
function chang(){
var divNo=byTag("div")[0];
if(b)
{
divNo.style.height="8px";
divNo.style.overflow="hidden";
b=false;
}
else
{
divNo.style.height="8px";
divNo.style.overflow="visible";
b=true;
}
/*
if(divNo.className=="close")
{
divNo.className=="open"
}else{
divNo.className=="close";
}*/
}

</script>
<style type="text/css">
.open{
height:8px;
overflow:visible;
}
.close{
height:8px;
overflow:hidden;
}
</style>
<body>
<div onclick="chang()">
张三的歌
</div >
</body>
</html>

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