<html >
<head>
<title>加法運算器</title>
<head>
<title>加法運算器</title>
<script>
function add() {
var a = parseInt(document.getElementById('a').value);
var b = parseInt(document.getElementById('b').value);
document.getElementById('result').value = a+b ;
}
</script>
</head>
<body>
<input id="a" type="text" />+<input id="b" type="text" />
<button onclick="add()">＝</button>
<output id="result"></output>
</body>
</html>
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