js设置和读取cookie

// 设置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();
}

// 读取Cookie
function getCookie(name) {
   var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
   if (arr = document.cookie.match(reg))
       return unescape(arr[2]);
   else
       return null;
}