code: function _getActiveCfg(type, cfg) {
    if (type === 'line' || type === 'smoothLine') {
      // 线加粗
      var lineWidth = cfg.lineWidth || 0;
      return {
        lineWidth: lineWidth + 1
      };
    }
    var opacity = cfg.fillOpacity || cfg.opacity || 1;
    return {
      fillOpacity: opacity - 0.15,
      strokeOpacity: opacity - 0.15
    };
  }
docs: 鼠标悬浮触发active状态