util-helpers/lib/isBankCard.js

一个基于业务场景的工具方法库

'use strict';

var ut2 = require('ut2');

var reg = /^[1-9]\d{9,20}$/;
var regLoose = /^\d{8,30}$/;
function sumCheckCode(numStr) {
    var numArr = (numStr + '').replace(/\D/g, '').split('').reverse();
    var sum = 0;
    for (var i = 0; i < numArr.length; i++) {
        var currNum = parseInt(numArr[i]);
        sum += i % 2 === 0 ? currNum * 2 - (currNum > 4 ? 9 : 0) : currNum;
    }
    var mod = sum % 10;
    return mod !== 0 ? 10 - mod : 0;
}
function isBankCard(value, options) {
    if (options === void 0) { options = {}; }
    var _a = options.loose, loose = _a === void 0 ? false : _a, _b = options.luhn, luhn = _b === void 0 ? false : _b;
    var valueStr = ut2.toString(value);
    var validateResult = loose ? regLoose.test(valueStr) : reg.test(valueStr);
    if (validateResult && luhn) {
        var precode = valueStr.substring(0, valueStr.length - 1);
        var checkCode = valueStr[valueStr.length - 1];
        return checkCode === String(sumCheckCode(precode));
    }
    return validateResult;
}
isBankCard.sumCheckCode = sumCheckCode;

module.exports = isBankCard;