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