即使在 javascript 无限位数中，如何在点后做半圆? [英] how to do round half even in javascript unlimited digits after point?

问题描述

我想将 26.955 四舍五入为 26.96

I want to have 26.955 rounded to 26.96

我的意思是如果我有数字 0-4 我想把它们四舍五入如果他们是 5-9 我想把他们围起来

I mean if I have numbers 0-4 I want to round them down and if they are 5-9 I want to round them up

我考虑过 parseFloat(number).toFixed(2) 但是它返回给我 26.95，我需要 26.96我使用了 Math.round 但这也不起作用，我看到了 Math.round10 但它告诉我这个函数不存在所以我不知道如何解决我的问题.

I considered parseFloat(number).toFixed(2) however it returns me 26.95, I need 26.96 I used Math.round but this doesn't work either, I saw Math.round10 but it told me this function doesn't exist so I don't know how to solve my problem.

更新:在点之后我并不总是有 3 位数字，我有超过 26.956736489

UPDATE: I don't have always 3 digits after point I have more than that I would have 26.956736489

你提到的重复谈论 .fixed(2) 我是说它甚至不能工作一半它不是重复

your mentioned duplicate talks about .fixed(2) I am saying it is not working for half even it is not a duplicate

推荐答案

尝试

Math.round(29.955*100)/100; //29.96

或者很酷的函数式方法

function round(n) {
   n = Math.pow(10,n);
   return function(num) {
       return Math.round(num*n)/n;
   }
}

var round2 = round(2);
var num = 29.9555;
console.log(round2(num));

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