Javascript:如何舍入十进制值? [英] Javascript:How can I round up decimal values?

问题描述

我有一个像 1724.1000000000001 这样的值，如何在javascript中将这样的值四舍五入到 1724.11 ?我需要通用函数.请帮忙...

I have a value like 1724.1000000000001,How can I round up values like such to 1724.11 in javascript? I need a generic function.Please help...

推荐答案

一种简单的方法是:

var num = 1724.1000000000001;
num = Math.ceil(num * 100) / 100;
alert(num); //  1724.11

工作方式:

Ceil会将值四舍五入.但是您要有2个十进制数字.最好的方法是:

Ceil will round the value up. But you want to have 2 decimal numbers. The best way to do this is to:

1. 将值乘以100
2. 把它弄清楚
3. 将其除以100.

现在，您有一个向上舍入的值，带有2个小数位.这就是发生的情况:

Now you have an up rounded value with 2 decimals. This is what happens:

1724.1000000000001 * 100 = 172410.00000000001
round-up on 172410.00000000001 = 172411
172411 / 100 = 1724.11

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