//js正则实现用户输入银行卡号的控制及格式化
<script language="javascript" type="text/javascript">function formatBankNo (BankNo){ if (BankNo.value == "") return; var account = new String (BankNo.value); account = account.substring(0,22); if (account.match (".[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{7}") == null){ if (account.match (".[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{7}|" + ".[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{7}|" + ".[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{7}|" + ".[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{7}") == null){ var accountNumeric = accountChar = "", i; for (i=0;i<account.length;i++){ accountChar = account.substr (i,1); if (!isNaN (accountChar) && (accountChar != " ")) accountNumeric = accountNumeric + accountChar; } account = ""; for (i=0;i<accountNumeric.length;i++){ if (i == 4) account = account + " "; if (i == 8) account = account + " "; if (i == 12) account = account + " "; account = account + accountNumeric.substr (i,1) } } } else { account = " " + account.substring (1,5) + " " + account.substring (6,10) + " " + account.substring (14,18) + "-" + account.substring(18,25); } if (account != BankNo.value) BankNo.value = account;}</script><input type="text" value="" size="25" onkeyup="formatBankNo(this)" onkeydown="formatBankNo(this)" name="account" id="account">
