переменное число аргументов

js/script.js

function funMake() {
var res = 0;
for(var i=0; i<arguments.length; i++) {
res+=arguments[i];
document.write(arguments[i] + ' ');
}
document.write('= ' + res);
}

function funMake() {
var res = 0;
for(var i=0; i<arguments.length; i++) {
res+=arguments[i];
document.write(arguments[i] + ' ');
}
document.write('= ' + res);
}

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<script src="js/script.js"></script>
</head>
<body>
<script>
funMake(1, 2, 3, 4, 5);
</script>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<script src="js/script.js"></script>
</head>
<body>
<script>
funMake(1, 2, 3, 4, 5);
</script>
</body>
</html>