验证银行卡号

作者: blank的小粉er | 来源:发表于2017-07-20 10:58 被阅读0次

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        input{
            width:400px;
            height:40px;
            font-size:16px;
            border:1px solid #ccc;
        }
    </style>
</head>
<body>
    <h1>银行卡号输入</h1>
    <hr>


    <span>请输入您的银行卡号:</span>
    <br>
    
    <input type="text" name="" id="bank_number" maxlength="23">

    <script>
        //获取input对象
        var input = document.getElementById('bank_number');

        //给input绑定事件
        input.onkeyup = function(){
            //执行替换
            input.value = input.value.replace(/\D/g, '');

            //执行替换
            input.value = input.value.replace(/(\d{4})(?=\d)/g, '$1 ');
        }

    </script>

</body>
</html>