Javascript验证Visa和MasterCard信用卡号的方法
本文实例讲述了Javascript验证Visa和MasterCard信用卡号的方法。分享给大家供大家参考。具体实现方法如下：
visa验证：
<HTML>
<head>
<title>VisaExample</title>
<scripttype="text/javascript">
functionluhnCheckSum(sCardNum){
variOddSum=0;
variEvenSum=0;
varbIsOdd=true;
for(vari=sCardNum.length-1;i>=0;i--){
variNum=parseInt(sCardNum.charAt(i));
if(bIsOdd){
iOddSum+=iNum;
}else{
iNum=iNum*2;
if(iNum>9){
iNum=eval(iNum.toString().split("").join("+"));
}
iEvenSum+=iNum;
}
bIsOdd=!bIsOdd;
}
return((iEvenSum+iOddSum)%10==0);
}
functionisValidVisa(sText){
varreVisa=/^(4\d{12}(?:\d{3})?)$/;
if(reVisa.test(sText)){
returnluhnCheckSum(RegExp.$1);
}else{
returnfalse;
}
}
functionvalidate(){
varoInput1=document.getElementById("txt1");
if(isValidVisa(oInput1.value)){
alert("Valid");
}else{
alert("Invalid!");
}
}
</script>
</head>
<body>
<P>VisaNumber:<inputtype="text"id="txt1"/><br/>
<inputtype="button"value="Validate"onclick="validate()"/></p>
</body>
</html>
MasterCard验证：
<html>
<head>
<title>MasterCardExample</title>
<scripttype="text/javascript">
functionluhnCheckSum(sCardNum){
variOddSum=0;
variEvenSum=0;
varbIsOdd=true;
for(vari=sCardNum.length-1;i>=0;i--){
variNum=parseInt(sCardNum.charAt(i));
if(bIsOdd){
iOddSum+=iNum;
}else{
iNum=iNum*2;
if(iNum>9){
iNum=eval(iNum.toString().split("").join("+"));
}
iEvenSum+=iNum;
}
bIsOdd=!bIsOdd;
}
return((iEvenSum+iOddSum)%10==0);
}
functionisValidMasterCard(sText){
varreMasterCard=/^(5[1-5]\d{2})[\s\-]?(\d{4})[\s\-]?(\d{4})[\s\-]?(\d{4})$/;
if(reMasterCard.test(sText)){
varsCardNum=RegExp.$1+RegExp.$2+RegExp.$3+RegExp.$4;
returnluhnCheckSum(sCardNum);
}else{
returnfalse;
}
}
functionvalidate(){
varoInput1=document.getElementById("txt1");
if(isValidMasterCard(oInput1.value)){
alert("Valid");
}else{
alert("Invalid!");
}
}
</script>
</head>
<body>
<P>MasterCardNumber:<inputtype="text"id="txt1"/><br/>
<inputtype="button"value="Validate"onclick="validate()"/></p>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。