What is the use of the output tag in html5?
In W3C, he uses an output tag, but there is nothing after it. Then onforminput is the event that occurs when the form obtains and fills in the data. What does the form obtain the data? When does it obtain the data, the Javascript event called will assign the value to the output. But the output cannot be output. How can I output it to this tag?
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
function resCalc()
{
numA=document.getElementById("num_a").value;
numB=document.getElementById("num_b").value;
document.getElementById("result").value=Number(numA)+Number(numB);
}
</script>
</head>
<body>
<p>使用 output 元素的简易计算器：</p>
<form onsubmit="return false">
<input id="num_a" /> +
<input id="num_b" /> =
<output id="result" onforminput="resCalc()"></output>
</form>
</body>
</html>Result;
and then add oninput="resCalc()" in
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