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计算结果与Excel保持一致

问题：为什么计算结果与Excel不一致？

背景：用户在SpreadJS中进行公式的填报，导出到Excel后，发现一部分公式结果不一致。所以本文将解释为什么不一致及如何做到一致。

SpreadJS默认计算模式下，部分函数的计算结果可能与Excel中不一致，例如对于一些逻辑与或运算，如下图，

image

在Excel中，对C2单元格应用And函数，引用的A2,B2单元格为文本内容，在Excel中返回#value，即引用数据不合法的含义。这是因为在Excel中，逻辑函数的判断参数不能为文本或者空。

但对于这类函数，在SpreadJS默认的计算逻辑下，会返回True，这是因为在前端js中，对一些字符串进行判断时，会返回逻辑值。这一特性，在一些客户的业务场景下是比较符合业务场景的。但对于一些做类Excel业务场景下，这一点与Excel的表现属于冲突，可能会被使用者当成是产品的bug。

为了兼顾JavaScript特性，又能满足Excel的计算逻辑，SpreadJS提供了切换计算模式的API：设置ExcelCompatibleCalcMode属性，开启兼容模式后，公式计算结果将和Excel一致。

为了兼容老版本，这个属性默认关闭。

如果想要与Excel的计算结果相同，可以使用下面的API来设置：

GC.Spread.CalcEngine.ExcelCompatibleCalcMode = true

作者: WinnyZhang | 审核：ElliaDuan | 更新时间：2023.11.29