具体参考：https://github.com/jondavidjohn/payform

插件js: jquery.payform.js

具体操作

alert($.payform.validateCardNumber('4242424242424242'));//true
 alert($.payform.parseCardType('4242424242424242'));//visa / Visa
 alert($.payform.parseCardType('6042708104454470'));//discover / Discover
 alert($.payform.parseCardType('5265541846020487'));//mastercard / Master
 alert($.payform.parseCardType('3412121212121212'));//amex / Express