本文实例讲述了js实现模拟银行卡账号输入显示效果。分享给大家供大家参考，具体如下：

先来看运行效果截图如下：

在线演示地址如下：

http://demo.jb51.net/js/2015/js-mn-bank-card-input-style-codes/

具体代码如下：

<script language="javascript" type="text/javascript"> function www_jb51_net (BankNo) { if (BankNo.value == "") return; var account = new String (BankNo.value); account = account.substring(0,22); /*帐号的总数, 包括空格在内 */ if (account.match (".[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{7}") == null) { /* 对照格式 */ 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++) { /* 可将以下空格改为-,效果也不错 */ if (i == 4) account = account + "-"; /* 帐号第四位数后加空格 */ if (i == 8) account = account + "-"; /* 帐号第八位数后加空格 */ if (i == 12) account = account + "-";/* 帐号第十二位后数后加空格 */ 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; } function checkBankNo (BankNo) { if (BankNo.value == "") return; if (BankNo.value.match (".[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{7}") == null) { if (BankNo.value.match ("[0-9]{19}") != null) www_jb51_net (BankNo) }} function checkEnterForFindListing(e){ var characterCode; if(e && e.which){ e = e; characterCode = e.which ; } else{ e = event; characterCode = e.keyCode; } if(characterCode == 22){ document.forms[getNetuiTagName("findListingForm")].submit(); return false; } else{ return true ; }} </script> 只能输入数字，并且每输入4位数字会增加一个 - <br /> <input type="text" value="" size="25" onkeyup="www_jb51_net(this)" onkeydown="www_jb51_net(this)" name="account" id="account">

希望本文所述对大家JavaScript程序设计有所帮助。