JS操作cookies方法

//JS操作cookies方法!   
  
//写cookies   
  
function setCookie(name,value)   
{   
    var Days = 6;   
    var exp = new Date();   
    exp.setTime(exp.getTime() + Days*24*60*60*1000);   
    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();   
}