<html lang="ko">
<head>
<meta charset="UTF-8">
<title>JavaScript Predefined Function</title>
</head>
<body>
<h1>eval() 함수</h1>
<script>
var x = 10, y = 20;
var a = eval("x + y");
var b = eval("y * 3");
document.write(a + "<br>" + b);
</script>
</body>
</html>