<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<body>
<input type="text" id="a">
<br>
<input type="text" id="b">
<br>
<button onClick=fun() > Result</button>
<br>
<script type="text/javascript">
function fun()
{
var a1 =document.getElementById("a").value;
var b1 =document.getElementById("b").value;
alert(+a1 + +b1);
}
</script>
</body>
</html>
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