var MSG_UNLOAD="如果你此时刷新页面，页面信息可能会丢失，确认刷新吗?";
        var UnloadConfirm = {};
        //启用监听浏览器刷新、关闭的方法
        UnloadConfirm.set = function(confirm_msg){
        window.onbeforeunload = function(event){
            event = event || window.event;
            event.returnValue = confirm_msg;
        }
        }
        //关闭监听浏览器刷新、关闭的方法
        UnloadConfirm.clear = function(){
        window.onbeforeunload = function(){};
        }
        UnloadConfirm.set(MSG_UNLOAD);