js设置页面cookie

function setCookie(name, value, secs)
{
    var exp = new Date();
    exp.setTime(exp.getTime() + secs*1000);
    arr = document.domain.split(".");
    if (arr.length == 2) {
        domain = "."+document.domain;
    } else {
        domain = "."+arr[arr.length-2]+"."+arr[arr.length-1];
    }
    document.cookie = name+"="+encodeURIComponent(value)+";expires="+exp.toGMTString()+";path=/;domain="+domain;
}
function getCookie(name)
{
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
    if (arr=document.cookie.match(reg)) {
        return decodeURIComponent(arr[2]);
    }
    return null;
}