'自定义函数：顾名思义，就是自己定义的函数。 '为什么使用自定义函数：exce内置了很多有用的函数。但仍无法满足工作需求。 '自定义函数的作用：简化复杂的公式。可以和工作表函数相互嵌套使用 ' ' ' Function 函数名(参数1,参数2....) ' 代码 ' 函数名=代码执行的结果 ' End Function '

'1.函数名称可能有函数，也可以像now,today,rand等函数一样不需要任何参数 Public Function stname() stname = ActiveSheet.Name '返回当前工作表名 End Function

Public Function wbname() wbname = ThisWorkbook.Name '返回工作簿名 End Function

'有参数的自定义函数 Function nas(num As Integer) '提取工作表名或工作簿名 If num = 0 Then nas = ActiveSheet.Name ElseIf num = 1 Then nas = ThisWorkbook.Name End If End Function

'1.自定义工作函数的调用

Function wbname() wbname = ActiveWorkbook.Name End Function

Function wbnames() i = InStr(wbname, ".xls") '调用自定义的工作表函数，找到.xls所在的位置 j = Left(wbname, i - 1) '调用自定义的工作表函数 wbnames = j End Function

'2.自定义工作表函数的编写与运用范围 ' '自定义工作表函数的代码只能编写在：标准模块中，不能在工作表中或thisworkbook中 '到目前为止我们编写的自定义函数只能在当前工作簿运行。要在所有工作簿中运行则： 'A.将编写在标准模块中的自定义函数代码保存为：加载宏。 'B.将加载的宏保持运用即可 ' '提示：与应用程序事件程序的操作方法相似

案例：

参数不定的自定义函数：

参数值默认和参数缺省：

案例：返回不重复随机数（结果是数组）

Function sjs(最小值 As Integer, 最大值 As Integer, 所需个数 As Integer) Application.Volatile Set d = CreateObject("scripting.dictionary") Do i = Application.RandBetween(最小值, 最大值) d(i) = "" Loop Until d.Count = 所需个数 sjs = d.keys End Function

Sub dd() Set d = CreateObject("scripting.dictionary") Do i = Application.RandBetween(1, 9) d(i) = "" Loop Until d.Count = 4 sj = d.keys End Sub

案例2：

Function celljoin(区域 As Range, Optional 合并符 As String = "-") arr = Application.Transpose(Application.Transpose(区域)) celljoin = Join(arr, 合并符) End Function

Function 去除(rng As Range, Optional shuzi As Integer = 2) Set regx = CreateObject("vbscript.regexp") With regx .Global = True If shuzi = 0 Then .Pattern = "\d" '去数字 ElseIf shuzi = 1 Then .Pattern = "[a-zA-Z]" '去字母 ElseIf shuzi = 2 Then .Pattern = "[一-龢]" '去汉字 End If 去除 = .Replace(rng, "") End With End Function

案例3：

Function jia(ParamArray num()) For Each n In num m = m + n Next jia = m End Function

Function joins(ParamArray arr()) For Each ar In arr For Each a In ar txt = txt & a.Value Next Next joins = txt End Function '注意： '1.如果参数不定，那么不能指定参数的数据类型 '2.如果有不定参数，不定参数一定要写在最后。 '

案例3：

Function 身份证(rng As Range, Optional 提取内容 As String = "年龄") If 提取内容 = "年龄" Then 身份证 = Year(Now()) - (19 & Mid(rng, Len(rng) / 2, 2)) ElseIf 提取内容 = "性别" Then 身份证 = IIf(Mid(rng, 15, 3) Mod 2, "男", "女") End If End Function

下图用excel：

案例4：单元颜色求和(字典+自定义函数)

Function COLORSUM(单元格区域 As range, 汇总的颜色 As range) Set d = CreateObject("Scripting.Dictionary") For Each Rng In 汇总的颜色 d(Rng.Interior.ColorIndex) = "" Next For Each ci In d.keys For Each Rng In 单元格区域 If Rng.Interior.ColorIndex = ci Then r = r + Rng.Value End If Next Next COLORSUM = r End Function

Sub test() Set d = CreateObject("Scripting.Dictionary") Set 区域 = Application.InputBox("区域选择", , , , , , , 8) Set 颜色 = Application.InputBox("颜色选择", , , , , , , 8) For Each Rng In 颜色 d(Rng.Interior.ColorIndex) = "" Next For Each ci In d.keys For Each Rng In 区域 If Rng.Interior.ColorIndex = ci Then r = r + Rng.Value End If Next Next MsgBox r

End Sub

案例5：反转字符与数字求和

Function DD(rng As Range) '反转字符 For i = Len(rng) To 1 Step -1 a = Mid(rng, i, 1) b = b & a Next DD = b End Function

（解释:）

Function 求和(rng As Range, Optional s As String = "") Application.Volatile Set regx = CreateObject("vbscript.regexp") With regx .Global = True .Pattern = "\d" & s Set mat = .Execute(rng) End With For Each m In mat n = n + m * 1 Next 求和 = n End Function

解释：关于Application.Volatile易失性函数看下面链接

易失性函数Volatile | Excel VBAhttp://xixiacademy.com/html/ExcelVBA/Function/ExcelVBA_VolatileFunction.html

案例5:提取不重复值

Function 不重复值(rng As Range) Set d = CreateObject("scripting.dictionary") For Each rn In rng d(rn.Value) = "" Next 不重复值 = d.keys End Function

Function 不重复2(rng As Range, Optional num As Integer = 0) Set d = CreateObject("scripting.dictionary") Set regx = CreateObject("vbscript.regexp") With regx .Global = True If num = 0 Then .Pattern = ".+" '所有值的不重复 ElseIf num = 1 Then .Pattern = "[一-龢]+" '汉字不重复 ElseIf num = 2 Then .Pattern = "[a-zA-Z]+" '字母不重复 ElseIf num = 3 Then .Pattern = "\d+" '数字不重复 End If For Each rn In rng For Each m In .Execute(rn) d(m.Value) = "" Next Next 不重复2 = d.keys End With End Function

ps：如果上面看懂了，下面就不用看了，不然看的头疼！

ByVal是值传递，ByRef是地址传递

回顾11章中的内容:

ByVal是值传递，ByRef是地址传递

好了，参数讲完，回归，function用法：