var Cookie={
      set: function (name, value, days) {
          var d = new Date;
          d.setTime(d.getTime() + 24*60*60*1000*days);
          window.document.cookie = name + "=" + value + ";path=/;expires=" + d.toGMTString();
      },
      get: function (name) {
          var v = window.document.cookie.match(‘(^|;) ?‘ + name + ‘=([^;]*)(;|$)‘);
          return v ? v[2] : null;
      },
      delete: function (name) {
          this.set(name, ‘‘, -1);
      }
};

Cookie的存储、获取、删除操作