<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>jQuery</title>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script>
function viewName(a){
userName = getName(a);
alert(userName+'입니다.');
}
function getName(a){
var userName = "";
userName = "홍길동";
var userNo = a + 10;
return userName+userNo;
//alert(userName);
}
</script>
</head>
<body>
function test
<button onclick="viewName(3);">클릭</button>
</body>
</html>