• 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 Operators</title>
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</head>
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​
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<body>
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​
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    <h1>instanceof 연산자</h1>
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​
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    <script>
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        var str = new String("이것은 문자열입니다.");
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        document.write(str + "<br>");
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        document.write((str instanceof Object) + "<br>");
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        document.write((str instanceof String) + "<br>");
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        document.write((str instanceof Array) + "<br>");
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        document.write((str instanceof Number) + "<br>");
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        document.write(str instanceof Boolean);
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    </script>
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</body>
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​
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</html>