操作cookie

$.extend($, {

     setCookie: function(c_name, value, expiredays) {

          var exdate = new Date();

          exdate.setDate(exdate.getDate() + expiredays);

          document.cookie = c_name + "=" + escape(value) + ((expiredays === undefined) ? "" : ";expires=" + exdate.toGMTString());

     },

     getCookie: function(c_name) {

          if (document.cookie.length > 0) {

               c_start = document.cookie.indexOf(c_name + "=");

               if (c_start != -1) {

                    c_start = c_start + c_name.length + 1;

                    c_end = document.cookie.indexOf(";", c_start);

                    if (c_end == -1) c_end = document.cookie.length;

                    return unescape(document.cookie.substring(c_start, c_end));

               }

          }

          return "";

     }

});