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 & "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

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