Mega Code Archive
Use eval function to run statement dynamically
<![CDATA[
<html>
<head>
<title>A Simple Page</title>
<script language="JavaScript">
var num1, op, num2, ans;
num1 = 2;
op = "+";
num2 = 3;
ans = eval(Number(num1)+ op + Number(num2));
alert(num1 + " " + op + " " + num2 + " = " + ans);
</script>
</head>
<body>
</body>
</html>
]]>