<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
(function(a,b){
var num = 10;
console.log(a+b+num);
}(1,2));
(function(a,b){
var num = 20;
console.log(a+b+num);
}(4,5));
</script>
</body>
</html>
原文：http://www.cnblogs.com/hsha/p/4709485.html