单元格背景颜色超过20列不能设置

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var spreadNS = GC.Spread.Sheets;

      var sheet1 = spread.getSheet(0);
      sheet1.name("刹车盘计划表");
      var columnStyle = new spreadNS.Style();
      columnStyle.backColor = "LightGoldenrodYellow";
      sheet1.setStyle(-1, 18, columnStyle, spreadNS.SheetArea.viewport);
      sheet1.setStyle(-1, 19, columnStyle, spreadNS.SheetArea.viewport);
      sheet1.setStyle(-1, 20, columnStyle, spreadNS.SheetArea.viewport);
      sheet1.setStyle(-1, 21, columnStyle, spreadNS.SheetArea.viewport);
      sheet1.setStyle(-1, 22, columnStyle, spreadNS.SheetArea.viewport);
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