js cookie 设置

(function () {
function getCookie(name) {
var start = document.cookie.indexOf(name + "=");
var len = start + name.length + 1;
if ((!start) && (name != document.cookie.substring(0, name.length))) {
return null;
}
if (start == -1) {
return null;
}
var end = document.cookie.indexOf(";", len);
if (end == -1) {
end = document.cookie.length;
}
return unescape(document.cookie.substring(len, end));
}
function setCookie(name, value, expires, path, domain, secure) {
var str = name + "=" + escape(value);
if (expires > 0) {
var date = new Date();
date.setTime(date.getTime() + expires * 24 * 3600 * 1000);
str += ";expires=" + date.toGMTString();
}
if (path) {
str += ";path=" + path;
}

if (domain) {
str += ";domain=" + domain;
}

if (secure) {
str += ";secure=" + secure;
}
document.cookie = str;
}
})();