Scirpt:
<!DOCTYPE HTML>
<html lang="en">
<head>
</head>
<body>
<script language="JavaScript" type="text/javascript">
<!--
function hitung(){
var kalkulator = document.form1;
var a=eval(kalkulator.a.value);
var b=eval(kalkulator.b.value);
var operasi= kalkulator.opt.value;
if (operasi == "penjumlahan") {
var c = a + b;
}else if (operasi == "pengurangan") {
var c = a - b;
} else if (operasi == "perkalian") {
var c = a * b;
} else if (operasi == "pembagian") {
var c = a / b;
}
kalkulator.hasil.value = c;
}
function resetForm(){
document.form1.reset();
}
//-->
</script>
<center>
<h4 font size= "5"> Simple Calculator</font></h4>
<form name="form1" action="#">
<input type="text" name="a" />
<select name="opt">
<option value="penjumlahan"> + </option>
<option value="pengurangan"> - </option>
<option value="perkalian"> * </option>
<option value="pembagian"> / </option>
</select>
<input type="text" name="b" />
<input type="button" value="=" onClick="hitung()" />
<input type="text" name="hasil" disabled="true" /> <br/>
<p>
<p>
<input type="button" value="Clear" onClick="resetForm()" />
</form>
</body>
</html>
HASIL :
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