<!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" xml:lang="zh-cn">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>网页标题</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css"></style>
<script type="text/javascript">
/*
999999999
88888888
7777777
666666
55555
4444
333
22
1
22
333
4444
55555
666666
7777777
88888888
999999999
*/
for(var i=9;i>=2;i--){
for(var j=1;j<=i;j++){
document.write(i);
}
document.write("<br/>");
}
for(var i=1;i<10;i++){
for(var j=1;j<=i;j++){
document.write(i);
}
document.write("<br/>");
}
</script>
</head>
<body>
</body>
</html>
9999999999999999999999999999999
原文：http://www.cnblogs.com/wangxiaofeng2/p/6147832.html