顺序错了~在你运行脚本的时候还没有生成div呢~吧js放在div后面就好了
<!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=UTF-8" />
<title> New Document </title>
</head>
<body>
<div id='xx'>
</div>
<script language="javascript">
<!--
document.getElementById('xx').innerHTML = '给分哦!'
//-->
</script>
</body>
</html>