帮我写一段vba代码：统计A列和D列中相同字符数，把数量列在H列，相同字符列在I列，接着，用H列数据除以统计A列字符数量列在J列

以下是实现您要求的 VBA 代码：

Sub countCharacters()

Dim lastRow As Long
Dim i As Long, j As Long, k As Long
Dim count As Long
Dim dict As Object
Set dict = CreateObject("Scripting.Dictionary")

lastRow = Cells(Rows.count, "A").End(xlUp).Row

' 统计A列和D列中相同字符数
For i = 1 To lastRow
    If Not dict.Exists(Cells(i, "A").Value) Then
        count = 1
        For j = i + 1 To lastRow
            If Cells(j, "A").Value = Cells(i, "A").Value And Cells(j, "D").Value = Cells(i, "D").Value Then
                count = count + 1
            End If
        Next j
        dict.Add Cells(i, "A").Value & Cells(i, "D").Value, count
    End If
Next i

' 把数量列在H列，相同字符列在I列
k = 1
For Each key In dict.Keys
    Cells(k, "H").Value = dict(key)
    Cells(k, "I").Value = key
    k = k + 1
Next key

' 用H列数据除以统计A列字符数量列在J列
For i = 1 To lastRow
    Cells(i, "J").Value = dict(Cells(i, "A").Value & Cells(i, "D").Value) / Len(Cells(i, "A").Value)
Next i

End Sub

这段代码首先创建了一个字典对象 `dict`，用于存储统计结果。接着，使用两个循环分别统计 A 列和 D 列中相同字符的数量，并将结果保存到 `dict` 中。最后，再次循环 A 列，将数量和相同字符信息分别保存到 H 列和 I 列，并且计算出数量除以统计 A 列字符数量的结果保存到 J 列。