jQuery.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;    }};function getcookie(name) {var cookie_start = document.cookie.indexOf(name);var cookie_end = document.cookie.indexOf(";", cookie_start);return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length)));}function setcookie(cookieName, cookieValue, seconds, path, domain, secure) {    var expires = new Date();    expires.setTime(expires.getTime() + seconds);    document.cookie = escape(cookieName) + '=' + escape(cookieValue)                                            + (expires ? '; expires=' + expires.toGMTString() : '')                                            + (path ? '; path=' + path : '/')                                            + (domain ? '; domain=' + domain : '')                                            + (secure ? '; secure' : '');}

使用方法

提供方便方法操作cookie : 

$.cookie('the_cookie'); // 获得cookie

$.cookie('the_cookie', 'the_value'); // 设置cookie

$.cookie('the_cookie', 'the_value', { expires: 7 }); //设置带时间的cookie  7天

$.cookie('the_cookie', '', { expires: -1 }); // 删除

$.cookie('the_cookie', null); // 删除 cookie

设置cookie的名值对，有效期，路径，域，安全

$.cookie(’name’, ‘value’, {expires: 7, path: ‘/’, domain: ‘jquery.com’, secure: true});