7-7编程练习

来源：7-7 编程练习

慕粉1110144175

2019-03-14 18:15:45

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>arguments</title>
</head>
<body>
    <script type="text/javascript">
            // 补充代码
           function count () {
                var sum = 0 ;
                for (var i in arguments) {
                    sum ++;
                }
                return sum;
            }
 
            alert(count('y','n','n','i','v'));
    </script>
</body>
</html>

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