VB.NET實現驗證信用卡卡號

這篇文章主要介紹了VB.NET實現驗證信用卡卡號是否正確的代碼，主要根據luhn算法來驗證，有需要的小夥伴可以參考下。

VB.NET代碼驗證信用卡卡號是否正確，本代碼使用luhn算法驗證

Dim creditCardNumber As String
creditCardNumber = "1234567891234563" '這裏請自行輸入你要驗證的號碼
If creditCardNumber.Length < 16 Then
  Page.ClientScript.RegisterStartupScript(Me.GetType(), "dd", "alert('錯誤數字只有" & creditCardNumber.Length & "碼');", True)
Else
  Dim Int(15) As Integer
  Dim x, num, sun As Integer
  For x = 0 To 15
    num = creditCardNumber.Substring(x, 1)
    If (x + 1) Mod 2 <> 0 Then '偶數乘1奇數乘2
      Int(x) = num * 2
    Else
      Int(x) = num
    End If
  Next
  For x = 0 To 15
    If (Int(x) > 9) Then
      Int(x) = (Int(x) Mod 10) + 1
    End If
    sun += Int(x)
  Next
  If (sun Mod 10 = 0) Then
    Page.ClientScript.RegisterStartupScript(Me.GetType(), "ddd", "alert('正確的信用卡');", True)
  Else
    Page.ClientScript.RegisterStartupScript(Me.GetType(), "dd", "alert('錯誤);", True)
  End If
End If

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