• 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 String 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>문자열의 대소문자 변환</h1>
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​
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    <script>
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        var str = "JavaScript";
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​
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        document.write(str.toUpperCase() + "<br>"); // JAVASCRIPT
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        document.write(str.toLowerCase());          // javacript
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    </script>
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</body>
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​
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</html>