<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
input {
width: 50px;
}
</style>
</head>
<body>
<input type="text" name="" id="txt1">
<select name="" id="ysf">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" name="" id="txt2">
<button id="btn">=</button>
<input type="text" name="" id="sum">
<script>
var txt1 = document.getElementById('txt1');
var txt2 = document.getElementById('txt2');
var btn = document.getElementById('btn');
var sum = document.getElementById('sum');
btn.onclick = function () {
var tv1 = Number(txt1.value);
var tv2 = Number(txt2.value);
var yv = ysf.value;
switch (yv) {
case "+": sum.value = tv1 + tv2;
break;
case "-": sum.value = tv1 - tv2;
break;
case "*": sum.value = tv1 * tv2;
break;
case "/": sum.value = tv1 / tv2;
break;
}
}
</script>
</body>
</html>
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