单击浏览器右上角的X弹出提示窗口，简单实现。
<script language="javascript">
window.onunload = function ()
{
if (event.clientY < 0 && event.clientX> document.body.scrollWidth) {
//event.returnValue = 'Are you sure you want to leave the page? ';
window.alert('欢迎光临爱智旮旯的博客！')
}
}
</script>