js设置获取删除cookie

 function setCookie(name,value)  
    {  
        var Days = 30;  
        var exp = new Date();  
        exp.setTime(exp.getTime() + Days*24*60*60*1000);  
        document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();  
        var strsec = getsec(time);  
        var exp = new Date();  
        exp.setTime(exp.getTime() + strsec*1);  
        document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();  
    }  
    //读取cookies  
    function getCookie(name)  
    {  
        var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");  
        if(arr=document.cookie.match(reg))  
            return (unescape(arr[2]));  
        else  
            return null;  
    }  
    //删除cookies  
    function delCookie(name)  
    {  
        var exp = new Date();  
        exp.setTime(exp.getTime() - 1);  
        var cval=getCookie(name);  
        if(cval!=null)  
            document.cookie= name + "="+cval+";expires="+exp.toGMTString();  
    }