银行卡验证

function checkBankCardNumber(bankcardnumberResult ) {
    //长度校验
    if(bankcardnumberResult == "" || bankcardnumberResult.length < 16 || bankcardnumberResult.length > 19) {
        console.log("银行卡号位数必须在16~19之间，请完整输入银行卡号！");
        return false;
    }
    //开头6位校验
    var strBin="10,18,30,35,37,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,58,60,62,65,68,69,84,87,88,94,95,98,99";    
    if(strBin.indexOf(bankcardnumberResult.substring(0, 2)) == -1) {
        console.log("银行卡号开头6位不符合规范，请检查后重新输入！");
        return false;
    }
    //全数字校验
    var num = /^\d*$/;
    if(!num.exec(bankcardnumberResult)) {
        console.log("银行卡号必须全为数字，请检查后重新输入！");
        return false;
    }
    //Luhm验证
    var lastNum=bankcardnumberResult.substr(bankcardnumberResult.length-1,1);//取出最后一位（与luhm进行比较）
    var first15Num=bankcardnumberResult.substr(0,bankcardnumberResult.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Luhm值
    var k= parseInt(sumTotal)%10==0?10:parseInt(sumTotal)%10;        
    var luhm= 10-k;
    
    if(lastNum==luhm){
        console.log("银行卡号验证通过！");
        return true;
    }
    else{
        console.log("银行卡号不合法，请检查后重新输入！");
        return false;
    }
}

转载自 红尘黑白
原文链接：https://blog.csdn.net/qq_41887223/article/details/81809298