银行卡号验证--转-学习

//域名注册 目的：在引用多个框架下防止命名冲突

//var Namespace = new Object();//写法1
//Namespace.register = function (path) {
//    var ns = "",
//        arr = path.split("."); //分割
//    for (var i = 0; i < arr.length; i++) {
//        if (i > 0) ns += ".";
//        ns += arr[i];
//        eval("if(typeof(" + ns + ")=='undefined')" + ns + " = new Object()")
//    }
//}
//Namespace.register("W");
if (!window.W)window.W = {};//写法2
(function ($) {
    W.luhmCheck = function (bankno) {
        if (bankno.length < 16 || bankno.length > 19) {
            return false;
        }
        var num = /^\d*$/;//以数字开头
        if (!num.exec(bankno)) {
            return false;
        }
        //开头6位
        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(bankno.substring(0, 2)) == -1) {
            alert("银行卡号开头6位不符合规范");
            return false;
        }

        var lastNum = bankno.substr(bankno.length - 1, 1); //取出最后一位（与luhm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Luhm值
        var k = parseInt(sumTotal) % 10 == 0 ? 10 : parseInt(sumTotal) % 10;
        var luhm = 10 - k;
        if (lastNum == luhm) {
            alert("Luhm验证通过");
            return true;
        }
        else {
            alert("银行卡号必须符合Luhm校验");
            return false;
        }
    };
})(jQuery)