JavaScript Tutorial/Statement/Dynamic expressions
Версия от 18:52, 25 мая 2010; (обсуждение)
Dynamic expressions
<html>
<head>
<title>A Simple Page</title>
<script language="JavaScript">
<!--
var num1, op, num2, ans;
num1 = prompt("Enter a number:","a number");
op = prompt("Enter an operator (+, -, *, / and %)", "operator");
num2 = prompt("Enter another number:", "a number");
ans = eval(Number(num1)+ op + Number(num2));
alert(num1 + " " + op + " " + num2 + " = " + ans);
// -->
</script>
</head>
<body>
</body>
</html>