VB.NET实现验证信用卡卡号

VB.NET代码验证信用卡卡号是否正确,本代码使用luhn算法验证

Dim creditCardNumber As String
creditCardNumber = "1234567891234563" '这里请自行输入你要验证的号码
If creditCardNumber.Length < 16 Then
 Page.ClientScript.RegisterStartupScript(Me.GetType(), "dd", "alert('错误数字只有" & creditCardNumber.Length & "?');", 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 '偶数乘1奇数乘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('正确的信用卡');", True)
 Else
 Page.ClientScript.RegisterStartupScript(Me.GetType(), "dd", "alert('错误);", True)
 End If
End If

以上所述就是本文的全部内容了,希望对大家学习vb.net能够有所帮助。

作者:hebedich

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