这个alert()说是谈出一个对话矿
但是我这个程序怎么没啊
谢谢

<html>
<head>

</head>
<boby onUnload=stay()>
<senter>
   <font face=楷体 size=5 color=blue>新年好!</font>
   </center>
<script languauage="JavaScript">
   pageopen=new Data();
   function stay()
{
       pageclose=new Data();
       minutes=(pageclose.getminutes()-pageopen.getminutes());
       secords=(pageclose.getseconds()-pageopen.getseconds());
       time=(seconds+(minutes*60));
       alert("您刚才在窗口中停了"+time+"秒中");
}
   </script>
</boby>
</html>