关于cookie的path设置需要注意，如果不设置path:'/'的话，path则会根据目录自动设置[如:http://www.xxx.com/user/,path会被设置为 '/user']

$.extend({ /**  1. 设置cookie的值，把name变量的值设为value   example $.cookie(’name’, ‘value’); 2.新建一个cookie 包括有效期 路径 域名等example $.cookie(’name’, ‘value’, {expires: 7, path: ‘/’, domain: ‘jquery.com’, secure: true});3.新建cookieexample $.cookie(’name’, ‘value’);4.删除一个cookieexample $.cookie(’name’, null);5.取一个cookie(name)值给myvarvar account= $.cookie('name');**/    cookie: function(name, value, options) {        if (typeof value != 'undefined') { // name and value given, set cookie            options = options || {};            if (value === null) {                value = '';                options.expires = -1;            }            var expires = '';            if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {                var date;                if (typeof options.expires == 'number') {                    date = new Date();                    date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));                } else {                    date = options.expires;                }                expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE            }            var path = options.path ? '; path=' + options.path : '';            var domain = options.domain ? '; domain=' + options.domain : '';            var secure = options.secure ? '; secure' : '';            document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');        } else { // only name given, get cookie            var cookieValue = null;            if (document.cookie && document.cookie != '') {                var cookies = document.cookie.split(';');                for (var i = 0; i < cookies.length; i++) {                    var cookie = jQuery.trim(cookies[i]);                    // Does this cookie string begin with the name we want?                    if (cookie.substring(0, name.length + 1) == (name + '=')) {                        cookieValue = decodeURIComponent(cookie.substring(name.length + 1));                        break;                    }                }            }            return cookieValue;        }    } });