JavaScript卡PAN校验位Luhn验证 [英] JavaScript card PAN check digit Luhn verification
本文介绍了JavaScript卡PAN校验位Luhn验证的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用了以下链接中的代码来尝试验证信用卡，但是当我在现场提交错误数据时，我没有收到提醒。
I've used the code from the link below to try and validate a credit card, however I'm not getting an alert when I submit a the wrong data in the field.
我的表格如下：
<form id="myform" method="post" action="">
<p>Select credit card:
<select tabindex="11" id="CardType">
<option value="AmEx">American Express</option>
<option value="CarteBlanche">Carte Blanche</option>
<option value="DinersClub">Diners Club</option>
<option value="Discover">Discover</option>
<option value="EnRoute">enRoute</option>
<option value="JCB">JCB</option>
<option value="Maestro">Maestro</option>
<option value="MasterCard">MasterCard</option>
<option value="Solo">Solo</option>
<option value="Switch">Switch</option>
<option value="Visa">Visa</option>
<option value="VisaElectron">Visa Electron</option>
<option value="LaserCard">Laser</option>
</select>
</p>
<p>
Enter number:
<input type="text" id="CardNumber" maxlength="24" size="24" />
<input type="submit" id="submitbutton" onsubmit="Validate(Luhn);" />
</p>
</form>
也许我使用了错误的代码？
Maybe I'm using the wrong code?
推荐答案
移动 onsubmit =验证（Luhn）;
到表格标签并传递表格
像这样 - 注意我传递表格并从表格中找到数字。
我也移动了测试并返回false / return true
Like this - note I pass the form and find the number from the form. I also moved the test and return false/return true around
http://jsfiddle.net/mplungjan/VqXss/
function Validate(theForm) {
var Luhn = theForm.CardNumber.value;
var LuhnDigit = parseInt(Luhn.substring(Luhn.length-1,Luhn.length));
var LuhnLess = Luhn.substring(0,Luhn.length-1);
if (Calculate(LuhnLess)!=parseInt(LuhnDigit)) {
alert("\n\nYou have mis-typed your card number! \nPlease check and correct.\n\n")
return false;
}
return true;
}
</script>
</head>
<body>
<form id="myform" method="post" action="" onsubmit="return Validate(this)">
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