前台：<script type="text/javascript">
            
            window.onbeforeunload = function() {
            var n = window.event.screenX - window.screenLeft;
            var b = n > document.documentElement.scrollWidth-20;
            if(b && window.event.clientY < 0 || window.event.altKey)
            {
           
                if(confirm("你确信要退出吗？"))
                    {
                      ？？？？？
                    }
                else
                    {
                        alert("你按了取消，那就是返回false");
                    }
               
            } else{
               
                   }
            }   
        </script>
后台：按钮事件
      protected void btnQuit_Click(object sender, EventArgs e)
    {
        /**
         * 清除所有Cache
         **/
        IDictionaryEnumerator CacheEnum = HttpRuntime.Cache.GetEnumerator();
        while (CacheEnum.MoveNext())
        {
            Cache.Remove(CacheEnum.Key.ToString());
        }
        Session.Clear();
        Response.Redirect("~/Default.aspx");
    }
？？？？的地方怎么能调用后台的代码？

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/smilelzx/archive/2009/08/07/4423178.aspx