• 코드:
​x
 
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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 DataType</title>
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</head>
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​
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<body>
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​
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    <h1>typeof 연산자</h1>
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    <p id="result"></p>
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​
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    <script>
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        document.getElementById("result").innerHTML = (typeof 10) + "<br>";
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        document.getElementById("result").innerHTML += (typeof "문자열") + "<br>";
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        document.getElementById("result").innerHTML += (typeof true) + "<br>";
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        document.getElementById("result").innerHTML += (typeof undefined) + "<br>";
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        document.getElementById("result").innerHTML += (typeof null);
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    </script>
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</body>
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​
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</html>