如何在Javascript中应用C#等效的舍入方法 [英] How to apply C# equivalent rounding method in Javascript

问题描述

我正在实现一个混合移动应用程序，其中我必须代表用C#编写的桌面应用程序.

I am implementing an Hybrid mobile application in which I have to represent our Desktop application written in C#.

四舍五入一个值时，桌面应用程序和移动应用程序中的值不同.

When rounding off a value, the value differs between Desktop and Mobile application.

示例

C#中使用的代码:

Math.Round (7060.625, 2); // prints 7060.62
Math.Round (7060.624, 2); // prints 7060.62
Math.Round (7060.626, 2); // prints 7060.63

JS中使用的代码:

+(7060.625).toFixed(2); // prints 7060.63 (value differs)
+(7060.624).toFixed(2); // prints 7060.62
+(7060.626).toFixed(2); // prints 7060.63

如何更改JS代码以表示C#中的值.

How can I change the JS code to represent the value as in C#.

注意:

我们可以使用 Math.Round(7060.625，2，MidpointRounding.AwayFromZero);

但是我没有选择在那里更改.

But I have no option to change in there.

编辑1

四舍五入是不固定的.由用户在移动应用程序中选择.

Rounding off decimals is not fixed. It is chosen by user in mobile application.

推荐答案

您需要自定义四舍五入实现银行家四舍五入"或甚至四舍五入".

You need a custom implementation of rounding to implement "banker's rounding" or to-even rounding.

发件人:

JavaScript中的高斯/银行取整

function evenRound(num, decimalPlaces) {
    var d = decimalPlaces || 0;
    var m = Math.pow(10, d);
    var n = +(d ? num * m : num).toFixed(8); // Avoid rounding errors
    var i = Math.floor(n), f = n - i;
    var e = 1e-8; // Allow for rounding errors in f
    var r = (f > 0.5 - e && f < 0.5 + e) ?
                ((i % 2 == 0) ? i : i + 1) : Math.round(n);
    return d ? r / m : r;
}

console.log( evenRound(1.5) ); // 2
console.log( evenRound(2.5) ); // 2
console.log( evenRound(1.535, 2) ); // 1.54
console.log( evenRound(1.525, 2) ); // 1.52

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