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<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
<script>
function showResult() {
var a = document.getElementById("num1");
var b = document.getElementById("num2");
var c = parseInt(a.value)+parseInt(b.value); // parseInt 를 이용하여 문자열을 숫자로 변환
var d = document.getElementById("num3");
d.value = c;
}
</script>
</head>
<body>
<input type="text" id="num1"/>+
<input type="text" id="num2"/>=
<input type="text" id="num3"/>
<br/>
<input type="button" value="두수합" onclick="showResult();"/>
</body>
</html>
[결과]
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