js同域名下不同文件下使用coookie

//写cookies
function setCookie(name,value)
{
    var Days = 30;
    var exp = new Date();
    exp.setTime(exp.getTime() + Days*60*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString()+";path=/;domain=deikang.com";
} 

//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();
}