利用正则表达式来控制用户输入银行卡号以及格式化

//js正则实现用户输入银行卡号的控制及格式化

functionformatBankNo (BankNo){

if(BankNo.value =="")return;

varaccount =newString (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){

varaccountNumeric = accountChar ="", i;

for(i=0;i

accountChar = account.substr (i,1);

if(!isNaN (accountChar) && (accountChar !=" ")) accountNumeric = accountNumeric + accountChar;

}

account ="";

for(i=0;i

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;

}

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