/**Cookie 读写类    读：Cookie.get(name)    写：Cookie.set(name, value, domain, ttl/*是否持久* /)    删除: Cookie.clear(name)    绑定Cookie变化事件 Cookie.change(function(){}) */var Cookie = function () {    var prevCookie = null;    var _user = {};        jQuery(function(){        window.setInterval(function () {            if (!prevCookie || prevCookie != document.cookie) {                prevCookie = document.cookie;                jQuery(Cookie).trigger('cookie_change', prevCookie);            }        }, 1000);    });    return {        change: function(fn){        jQuery(this).bind('cookie_change', fn);        },        clear: function (name , domain) {            var date = new Date();            date.setTime(date.getTime() - 24 * 60 * 60 * 1000*10);            var cookie = name + "="+Cookie.get('show_div')+"; expires=" + date.toGMTString() + "; path=/;domain=."+domain;            document.cookie = cookie;        },        set: function (name, value, domain, ttl) {            var value = value ? encodeURIComponent(typeof(value) == 'string' ? value : JSON.stringify(value)) : "";            var expires = "";            if (value === "") {                ttl = -1;            }            if (typeof(ttl) != "undefined") {                var date = new Date();                date.setTime(date.getTime() + (ttl * 24 * 60 * 60 * 1000));                expires = "; expires=" + date.toGMTString();            }            try {                if (jQuery.browser.msie && value !== "") {                    var extra = 56 + (domain||'').length;                    var cookieByteLen = 0;                    if (document.cookie) {                        var cookieArr = document.cookie.split(/;\s*/);                        cookieByteLen = cookieArr.length * extra + document.cookie.length;                    }                    var _302e = Cookie.get(name, false);                    var _302f = _302e ? _302e.length : 0;                    if ((cookieByteLen + value.length - _302f) > 4096) {                        throw ("exceeds 4096 byte limit for cookie");                    }                }                document.cookie = name + "=" + value + expires + "; path=/;" + (domain ? (" domain=." + domain) : "");                return true;            } catch(e) {                return false;            }        },        get: function (name, parse) {            var cookieArr = document.cookie.split(/;\s*/);            for (var i = 0; i < cookieArr.length; ++i) {                var bits = cookieArr[i].split("=", 2);                if (bits[0] == name) {                    if (parse) {                        try {                            return eval("(" + decodeURIComponent(bits[1]) + ")");                        } catch(e) {}                    } else {                        return decodeURIComponent(bits[1]);                    }                }            }            return null;        }    };} ();