刷新、关闭等误操作造成当前页面信息的丢失的解决方案

有时候在编辑页面用户做修改后，可能会有刷新、关闭等误操作造成当前页面信息的丢失，
何不先提醒一下用户呢?

代码

<% @ Page Language = " C# "  AutoEventWireup = " true "  CodeBehind = " ProductEdit.aspx.cs "  Inherits = " Web.Admin.Product.ProductEdit "   %>
<! DOCTYPE html PUBLIC  " -//W3C//DTD XHTML 1.0 Transitional//EN "   " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >
< html xmlns = " http://www.w3.org/1999/xhtml " >
< head runat = " server " >
     < title > 产品修改 </ title >
     < link href = " ../images/Guide.css "  type = " text/css "  rel = " stylesheet "   />
     < link href = " ../images/index.css "  type = " text/css "  rel = " stylesheet "   />
     < link href = " ../images/MasterPage.css "  type = " text/css "  rel = " stylesheet "   />
     < link href = " ../images/xtree.css "  type = " text/css "  rel = " stylesheet "   />

     < script language = " javascript "  type = " text/javascript " >
        var pb_strConfirmCloseMessage;
        var pb_blnCloseWindow  =   false ;
        pb_strConfirmCloseMessage  =   " 您真的要离开本页吗? " ;
        function ConfirmClose() {
            window. event .returnValue  =  pb_strConfirmCloseMessage;
            pb_blnCloseWindow  =   true ;
        }
        function ShowConfirmClose(blnValue) {
             if  (blnValue) {
                document.body.onbeforeunload  =  ConfirmClose;
            }  else  {
                document.body.onbeforeunload  =   null ;
            }
        }
     </ script >

</ head >
< body onload = " ShowConfirmClose(true); " >
     < form id = " form1 "  runat = " server " >
</ form >
</ body >
</ html >