code: function(item,index){
      var _self = this,
        type = item.type || _self._getDefaultType(),
        cons = _self._getSeriesClass(type),
        cfg = _self._getSeriesCfg(type,item,index),
        series ;
      cfg.autoPaint = cfg.autoPaint || false;
  
      series  = _self.addGroup(cons,cfg);
      
      return series;
    }
docs: 添加数据序列
  @param {Chart.Series} item 数据序列对象