<html>
<head>
<script>
function hi(msg){
alert(msg);
}
</script>
</head>
<body onLoad="hi('안녕하세요');" onUnload="hi('안녕히 가세요');">
<a href="javascript:hi('안녕')">굿모닝</a>
<form>
<input type="button" value="인사하기" onclick="hi('안녕')">
</form>
</body>
</html>