code: function(axis,name){
      var _self = this,
        series = _self.getVisibleSeries(),
        rst = false;
  
      Util.each(series,function(item){
        if(item.get(name) == axis){
          rst = true;
          return false;
        }
      });
      return rst;
  
    }
docs: 是否存在关联的数据序列