2012104095.html 457 Bytes

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<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<button onclick="checkButtonClick()">CHECK</button>

<script>
    function checkButtonClick() {
        var filename = prompt('파일 명을 입력하세요');
        if(/\.html/g.test(filename)){
            document.write(filename);
        } else {
            alert('HTML 파일명을 입력하시오')
        }
    }
</script>
</body>
</html>