請大神看看哪里錯了，提交顯示空白
<!DOCTYPE ?HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>函數(shù)</title>
<script type="text/javascript">
function num(a,b){
if(a>b){
? ? ?return:a
}else if(a<b){
? ? return:b
}else
? ?return:a||b;
};
?document.write(" 5 和 4 的較大值是:"+"num(5,4)"+"<br>");
?document.write(" 6 和 3 的較大值是:"+"num(6,3)" );?
</script>
</head>
<body>
</body>
</html>
2016-11-17
已經(jīng)解決，謝謝了