<html>
<head>
<script type="text/javascript">
var txt=""
function message()
{
try
{
adddlert("Welcome guest!")
}
catch(err)
{
txt="本頁中存在錯誤。\n\n"
txt+="錯誤描述：" + err.description + "\n\n"
txt+="點擊“確定”繼續。\n\n"
alert(txt)
}
}
</script>
</head>
<body>
<input type="button" value="查看消息" οnclick="message()" />
</body>
</html>