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;
        }
    })();