excel运用自定义函数取得多个单元格中相同的字符

要在Excel中获取区域内各单元格字符串中的相同字符，可用下面的自定义函数。例如要在D1单元格获取A1:C1区域各单元格中相同的字符，如图：

???

??? 按Alt+F11，打开VBA编辑器，单击菜单“插入→模块”，在代码窗口中输入自定义函数：

Function GetDupChars(rRng As Range) As String
??? Application.Volatile
??? Dim i As Integer, j As Integer, k As Integer
??? Dim Str As String
??? Str = rRng.Item(1).Text
??? For i = 1 To Len(Str)
????? k = 0
????? For j = 2 To rRng.Cells.Count
????? If InStr(rRng.Item(j).Text, Mid(Str, i, 1)) Then k = k + 1
????? Next
????? If k = j - 2 And InStr(GetDupChars, Mid(Str, i, 1)) = 0 _
????????? Then GetDupChars = GetDupChars & Mid(Str, i, 1)
??? Next
End Function

??? 然后关闭VBA编辑器，在D1单元格中输入公式即可：

??? =GetDupChars(A1:C1)