代碼：

jQuery.cookie = function(name, value, options) {
    if (typeof value != 'undefined') { // name and value given, set cookie
        options = options || {};
        if (value === null) {
            value = '';
            options = $.extend({}, options); // clone object since it's unexpected behavior if the expired property were changed
            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
        }
        // NOTE Needed to parenthesize options.path and options.domain
        // in the following expressions, otherwise they evaluate to undefined
        // in the packed version for some reason...
        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;
    }

};

使用方法

jQuery操作cookie的插件,大概的使用方法如下
$.cookie('the_cookie'); //讀取Cookie值
$.cookie('the_cookie', 'the_value'); //設置cookie的值
$.cookie('the_cookie', 'the_value', {expires: 7, path: '/', domain: 'jquery.com', secure: true});//新建一個cookie 包括有效期 路徑 域名等
$.cookie('the_cookie', 'the_value'); //新建cookie
$.cookie('the_cookie', null); //刪除一個cookie

設置一個名稱為blog，值為css9.net的cookie:

$.cookie("blog", "css9.net");

設置一個名稱為blog，值為css9.net的cookie，同時設置過期時間（expires屬性）為7天：

$.cookie("blog", "css9.net", { expires: 7 });

設置一個名稱為blog，值為css9.net的cookie，設置過期時間（expires屬性）為7天，同時設置cookie的path屬性為”/admin”

$.cookie("blog", "css9.net", { path: '/admin', expires: 7 });

讀取Cookie：

讀取名稱為blog的cookie值：

alert( $.cookie("blog") );

刪除cookie：

$.cookie("example", null);