• 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 Object Method</title>
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</head>
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​
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<body>
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​
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    <h1>객체의 propertyIsEnumerable() 메소드</h1>
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​
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    <script>
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        function Dog(color, name, age) {
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            this.color = color;
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            this.name = name;
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            this.age = age;
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        }
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        var myDog = new Dog("흰색", "마루", 1);
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        // color 프로퍼티의 enumerable 속성을 false로 설정함.
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        Object.defineProperty(myDog, 'color', { enumerable : false} );
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        document.write(myDog.propertyIsEnumerable("color") + "<br>");   // false
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        document.write(myDog.propertyIsEnumerable("name") + "<br>");    // true
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        document.write(myDog.propertyIsEnumerable("age"));              // true
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    </script>
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</body>
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​
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</html>