output标签
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="" oninput="totalPrice.value=parseInt(price.value)*parseInt(number.value)">
<input type="text" id="price" value="5000" />
*<input type="number" id="number" value="1" />
=<output name="totalPrice" for="price number"></output>
</form>
</body>
</html>
略懂,略懂....