javascriptglobalStorage类代码

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             {
                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();
        }    
    }
}