js luhn银行卡号校验

js 银行卡号校验封装的方法

luhnCheck(bankno) {
  // bankno = '6217002540003927842'
  // bankno = '6222600810010710887'
  // bankno = '6225881414207430'
  console.log(bankno)
var lastNum = bankno.substr(bankno.length - 1, 1); //取出最后一位（与luhn进行比较）
var first15Num = bankno.substr(0, bankno.length - 1); //前15或18位
var newArr = new Array();
for (var i = first15Num.length - 1; i > -1; i--) { //前15或18位倒序存进数组
  newArr.push(first15Num.substr(i, 1));
}
var arrJiShu = new Array(); //奇数位*2的积 <9
var arrJiShu2 = new Array(); //奇数位*2的积 >9
var arrOuShu = new Array(); //偶数位数组
for (var j = 0; j < newArr.length; j++) {
  if ((j + 1) % 2 == 1) { //奇数位
      if (parseInt(newArr[j]) * 2 < 9) arrJiShu.push(parseInt(newArr[j]) * 2);
      else arrJiShu2.push(parseInt(newArr[j]) * 2);
  } else //偶数位
  arrOuShu.push(newArr[j]);
}
var jishu_child1 = new Array(); //奇数位*2 >9 的分割之后的数组个位数
var jishu_child2 = new Array(); //奇数位*2 >9 的分割之后的数组十位数
for (var h = 0; h < arrJiShu2.length; h++) {
  jishu_child1.push(parseInt(arrJiShu2[h]) % 10);
  jishu_child2.push(parseInt(arrJiShu2[h]) / 10);
}
var sumJiShu = 0; //奇数位*2 < 9 的数组之和
var sumOuShu = 0; //偶数位数组之和
var sumJiShuChild1 = 0; //奇数位*2 >9 的分割之后的数组个位数之和
var sumJiShuChild2 = 0; //奇数位*2 >9 的分割之后的数组十位数之和
var sumTotal = 0;
for (var m = 0; m < arrJiShu.length; m++) {
  sumJiShu = sumJiShu + parseInt(arrJiShu[m]);
}
for (var n = 0; n < arrOuShu.length; n++) {
  sumOuShu = sumOuShu + parseInt(arrOuShu[n]);
}
for (var p = 0; p < jishu_child1.length; p++) {
  sumJiShuChild1 = sumJiShuChild1 + parseInt(jishu_child1[p]);
  sumJiShuChild2 = sumJiShuChild2 + parseInt(jishu_child2[p]);
}
//计算总和
sumTotal = parseInt(sumJiShu) + parseInt(sumOuShu) + parseInt(sumJiShuChild1) + parseInt(sumJiShuChild2);
//计算luhn值
var k = parseInt(sumTotal) % 10 == 0 ? 10 : parseInt(sumTotal) % 10;
var luhn = 10 - k;
if (lastNum == luhn) {
          console.log("luhn验证通过")
  return true;
} else {
          console.log("银行卡号必须符合luhn校验")
  return false;
}
},

使用方法

import nothing from './util/nothing'//引用代码
let cardNumber = '6217002540003927842'
if (!this.$nothing.luhnCheck(cardNumber)) {
    uni.showToast({ title: '银行账号输入不合法！', icon: 'none' });
    return false;
}