单击浏览器右上角的X弹出提示窗口

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>