function bye() {
pageClose = new Date();
minutes = (pageClose.getMinutes() - pageOpen.getMinutes());
seconds = (pageClose.getSeconds() - pageOpen.getSeconds());
time = (seconds + (minutes * 60));
if (time == 1) {
time = (time + " 秒");
}
else {
time = (time + " 秒");
}
alert('您在这儿呆了' + time + '.欢迎再来！');
}

</SCRIPT>