请老师检查

来源：2-17 编程练习

KangarooL

2021-03-27 19:38:59

相关代码：

<!DOCTYPE html>
<html>

<head lang="en">
    <meta charset="UTF-8">
    <title>数据类型之NaN</title>
</head>

<body>
    <script>
        //补充代码
        var a = null, b = 10, c = '我是字符串', d = '10', e = undefined;
        document.write(isNaN(a) + '<br>');
        document.write(isNaN(b) + '<br>');
        document.write(isNaN(c) + '<br>');
        document.write(isNaN(d) + '<br>');
        document.write(isNaN(e));
    </script>
</body>

</html>