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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
Dim creditCardNumber As StringcreditCardNumber = "1234567891234563" '這里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 IfEnd If |
以上所述就是本文的全部內容了，希望對大家學習vb.net能夠有所幫助。
