Previously, empty cells were forced to numeric 0 in some contexts and to empty string in others, except in direct comparison where =A1=0 and =A1= &quot; &quot; both resulted in TRUE if A1 was empty. Emptiness now is inherited until used, so both =VLOOKUP(...)=0 and =VLOOKUP(...)= &quot; &quot; give TRUE if the lookup resulted in an empty cell being returned.
在以前的版本中，空白单元格在某些上下文中强制为 0，在另一些地方强制为空字符串，但在直接比较中有例外情况，如果 A1 为空，那么 =A1=0 和 =A1= &quot; &quot; 的结果都是 TRUE。空值一直延续到对该值的调用才发生改变，所以当 lookup 的结果是返回一个空单元格时就有 =VLOOKUP(...)=0 和 =VLOOKUP(...)= &quot; &quot; 的值是 TRUE。