【date_input】
<!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>
