code: function(_key,_event){
              var _cch = _pcache[_key];
              if (!_cch) return;
              _doClearAction(_key);
              var _conf = _cch.conf;
              if (_conf.retry>0){
                  _conf.retry--;
                  _cch.timer = window.setTimeout(
                      _doPlayAction._$bind(null,_key),
                      _conf.interval||500
                  );
              }else{
                  _doErrorCallback(_key,_event.code);
              }
          }
docs: error action