没有显示任何内容，大神帮忙看看有什么问题呗
<!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>比较操作符</title>
<script type="text/javascript">
var numa,numb,jq1,jq2;
numa=1;
numb=7;
jq1 = nuna>numb;
jq2 = numa!=nunb;
document.write("numa大于numb的分数吗？"+jq1+"<br>")
document.write("numa不等于numb的分数吗？"+jq2)
</script>
</head>
<body>
</body>
</html>
