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Javascript Form - 如何獲取文件上傳輸入框的TYPE屬性...

我們想知道如何獲取文件上傳輸入框的TYPE屬性。... 

<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
function submitBday() {
    var Q4A = "Your birthday is: ";
    var Bdate = document.getElementById('bday').value;
    var Bday = +new Date(Bdate);
    Q4A += Bdate + ". You are " + ~~ ((Date.now() - Bday) / (31557600000));
    var theBday = document.getElementById('resultBday');
    theBday.innerHTML = Q4A;
}

</script>
</head>
<body>
  <p id="resultBday"></p>
  <input type="date" name="bday" id="bday" onchange="submitBday()">
</body>
</html>