<html lang="ko">
<head>
<meta charset="UTF-8">
<title>JavaScript Predefined Function</title>
</head>
<body>
<h1>isNaN() 함수</h1>
<script>
document.write(isNaN(123) + "<br>");
document.write(isNaN(123e100) + "<br>");
document.write(isNaN(0) + "<br>");
document.write(isNaN(true) + "<br>");
document.write(isNaN(false) + "<br>");
document.write(isNaN(null) + "<br>");
document.write(isNaN("123") + "<br>");
document.write(isNaN("") + "<br>");
document.write(isNaN("문자열") + "<br>");
document.write(isNaN(undefined) + "<br>");
document.write(isNaN(NaN));
</script>
</body>
</html>