javascript - 一美元的上限 [英] javascript - ceiling of a dollar amount

问题描述

所以我在javascript中增加和减去浮点数，我需要知道如何总是取超过3位小数的任何数字的上限。例如：

3.19 = 3.19

3.191 = 3.20

3.00000001 = 3.01

解决方案

  num = Math.ceil（num * 100 ）/ 100; 
  

虽然由于浮点数的表示方式，您可能不会得到一个干净的数字，小数点后两位。出于显示的目的，总是做 num.toFixed（2）。

So I am adding and subtracting floats in javascript, and I need to know how to always take the ceiling of any number that has more than 3 decimal places. For example:

3.19 = 3.19

3.191 = 3.20

3.00000001 = 3.01

解决方案

num = Math.ceil(num * 100) / 100;

Though, due to the way floats are represented, you may not get a clean number that's to two decimal places. For display purposes, always do num.toFixed(2).

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