function behaviorUserdata(udObj)
{
var me = this;
if(CMInfo.Bs_Name=='IE') //IE下用userdata实现客户端存储
{
var loaded = ''; //当前已载入的文件名

this.udObj = getObject(udObj);
this.udObj.style.behavior = 'url(#default#userdata)';
this.value = this.udObj.value;
this.inhtml = this.udObj.innerHTML;

//检查文件是否存在,存在est=undefined并返回true否则返回false
this.exist = function(filename){
try{
me.udObj.load(filename);//将文件名为 filename的 XML 载入
me.loaded = filename;
return true;
}catch(e){ return false;}
}
//预加载
this.preLoad = function(filename){
if(me.loaded=='' || me.loaded!=filename){me.exist(filename);}
return me.loaded;
}
//获取指定的属性值
this.getAtrib = function(filename,atrib){
if(me.preLoad(filename)!='')
{
var val = me.udObj.getAttribute(atrib);
return val==null?"":val;
}return "";
}
//移除对象的指定属性
this.remAtrib = function(filename,atrib){
me.udObj.removeAttribute(atrib);
me.udObj.save(filename); //将对象数据保存到名为filename的XML文件里面
return true;
}
//设置指定的属性值
this.setAtrib = function(filename,atrib,val,expire){
var etime = typeof(expire)=="undefined"?24*60*60:expire;
me.udObj.expires = me.setExpire(etime);
me.udObj.setAttribute(atrib,val);
me.udObj.save(filename);
}
//设置一个系列的对象数据(即整个XML文件)失效
this.remPartion = function(filename){
if(me.exist(filename))
{
me.udObj.expires = me.setExpire(-1);
me.udObj.save(filename);
}
}
//设置有效期
this.setExpire = function(sec){
var oTimeNow = new Date();
oTimeNow.setSeconds(oTimeNow.getSeconds() + parseInt(sec));
return oTimeNow.toUTCString();
}
}else //非IE下用globalStorage实现客户端存储
{
var domain = document.domain;

//获取指定的属性值
this.getAtrib = function(filename,atrib){
var oTimeNow = new Date();
var etime = parseInt(window.globalStorage[domain][filename + "__expire"]);
if(!etime || etime < parseInt(oTimeNow.getTime()))
{
me.remPartion(filename);
return '';
}
return window.globalStorage[domain][filename + "__" + atrib];
}

//移除对象的指定属性
this.remAtrib = function(filename,atrib){
try{window.globalStorage.removeItem(filename + "__" + atrib);}catch(e){}//删除
return true;
}

//设置指定的属性值
this.setAtrib = function(filename,atrib,val,expire){
var etime = typeof(expire)=="undefined"?24*60*60:expire;
window.globalStorage[domain][filename + "__expire"] = me.setExpire(etime);
window.globalStorage[domain][filename + "__" + atrib] = val;
}

//设置一个系列的对象数据失效
this.remPartion = function(filename){
me.remAtrib(filename,"expire");
return true;
}

//设置有效期
this.setExpire = function(sec){
var oTimeNow = new Date();
oTimeNow.setSeconds(oTimeNow.getSeconds() + parseInt(sec));
return oTimeNow.getTime();
}
}
}