            }
          }, { 
            // 自定义
            point: { timestamp: dataList[dataList.length - 40].timestamp },
            styles: { symbol: { type: 'custom' } },
            checkEventCoordinateOnCustomSymbol: function ({ eventCoordinate, coordinate, size }) {
              return eventCoordinate.x > coordinate.x - 4 &&
               eventCoordinate.x < coordinate.x + 4 &&
               eventCoordinate.y > coordinate.y - 4 &&
               eventCoordinate.y < coordinate.y + 4
       