javascript控制cookies及在跳出本页给出提示，是否放弃操作！

javascript控制cookies及在跳出本页给出提示，是否放弃操作！(4)     str=name+"="+escape(value);
    if(hours)
      str+=";expires="+nextTime.toGMTString();
    if(path)
      str+=";path="+path;
    if(domain)
      str+=";domain="+domain;
    if(secure)
      str+=";secure";
    document.cookie=str;
    }
  this.GetValue=function(name){
    var rs=new RegExp("(^)"+name+"=([^;]*)(;$)","gi").exec(document.cookie),tmp;
    if(tmp=rs)
      return unescape(tmp[2]);
    return null;
    }
  }
var _c=new Cookie();
_c.SetValue("list1","啊",1);
_c.SetValue("list2","噢",1);
alert(_c.GetValue("list2"))
document.writeln(document.cookie);
//-->
</script>
</body>
</html>