JavaScript中的Modulo - 大量的 [英] Modulo in JavaScript - large number

问题描述

我尝试用JS'模数函数计算，但是得不到正确的结果（应该是1）。这是一段硬代码。

I try to calculate with JS' modulo function, but don't get the right result (which should be 1). Here is a hardcoded piece of code.

var checkSum = 210501700012345678131468;
alert(checkSum % 97);

Result: 66

这里的问题是什么？

问候，
Benedikt

Regards, Benedikt

推荐答案

Benedikt版本的一系列改进： cRest + =''+ cDivident;是一个错误修复; parseInt（divisor）可以将两个参数作为字符串传递;最后检查空字符串是否总是返回数值;添加了var语句，因此它不使用全局变量;将foreach转换为旧式，因此它适用于具有较旧Javascript的浏览器;修正了cRest == 0; bug（感谢@ Dan.StackOverflow）。

A bunch of improvements to Benedikt's version: "cRest += '' + cDivident;" is a bugfix; parseInt(divisor) makes it possible to pass both arguments as strings; check for empty string at the end makes it always return numerical values; added var statements so it's not using global variables; converted foreach to old-style for so it works in browsers with older Javascript; fixed the cRest == 0; bug (thanks @Dan.StackOverflow).

function modulo (divident, divisor) {
    var cDivident = '';
    var cRest = '';

    for (var i in divident ) {
        var cChar = divident[i];
        var cOperator = cRest + '' + cDivident + '' + cChar;

        if ( cOperator < parseInt(divisor) ) {
                cDivident += '' + cChar;
        } else {
                cRest = cOperator % divisor;
                if ( cRest == 0 ) {
                    cRest = '';
                }
                cDivident = '';
        }

    }
    cRest += '' + cDivident;
    if (cRest == '') {
        cRest = 0;
    }
    return cRest;
}

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