code: function (url, data, callback) {
              if (typeof data === 'function') {
                  callback = data;
                  data = undefined;
              }
              return get(url, data, callback, 'jsonp');
          }
docs: preform a jsonp request
  @param {String} url request destination
  @param {Object} [data] name-value object associated with this request
  @param {Function} [callback] success callback when this request is done.
  @param callback.data returned from this request with type specified by dataType
  @param {String} callback.status status of this request with type String
  @param {KISSY.IO} callback.io io object of this request
  @return {KISSY.IO}
  @member KISSY.IO
  @static