function sumLabel(){    const point = this;    const points = point.points;    const validPoints = points.filter((point) => point.isVisible());    if(point == validPoints) {      let value = 0;      for(let i = 0; i < validPoints.length; i++) {        value += validPoints.value;      }      return value.toFixed(0);  // 保留一位小数  } else {      return "";    }  }