为什么什么都不显示呢
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Math </title>
<script type="text/javascript">
document.write(Math.ceil(3.3))<br/>
document.write(Math.ceil(-0.1))<br/>
document.write(Math.ceil(-9.9))<br/>
document.write(Math.ceil(8.9))<br/>
</script>
</head>
<body>
</body>
</html>