JavaScript:舍入到小数位数,但是去掉额外的零 [英] JavaScript: Round to a number of decimal places, but strip extra zeros

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问题描述

下面是这个场景:当我得到 1.0 时,得到 .9999999999999999 b $ b我可以承受失去一个小数位的精度,所以我使用 .toFixed(15),这种工作。

四舍五入工作,但问题是,我给了 1.000000000000000

有没有办法要舍去许多小数位,但要多加一些空格?



注意: .toPrecision 不是我想要的;我只想指定小数点后的数字。

注意2:我不能只用 .toPrecision(1)因为我需要保持小数点后实际有数据的数字的高精度。理想情况下,将会有必要的小数位(至多15)。

C>>>> parseFloat(0.9999999.toFixed(4));
1
>>> parseFloat(0.0009999999.toFixed(4));
0.001
>>> parseFloat(0.0000009999999.toFixed(4));
0


Here's the scenario: I'm getting .9999999999999999 when I should be getting 1.0.
I can afford to lose a decimal place of precision, so I'm using .toFixed(15), which kind of works.

The rounding works, but the problem is that I'm given 1.000000000000000.
Is there a way to round to a number of decimal places, but strip extra whitespace?

Note: .toPrecision isn't what I want; I only want to specify how many numbers after the decimal point.
Note 2: I can't just use .toPrecision(1) because I need to keep the high precision for numbers that actually have data after the decimal point. Ideally, there would be exactly as many decimal places as necessary (up to 15).

解决方案

>>> parseFloat(0.9999999.toFixed(4));
1
>>> parseFloat(0.0009999999.toFixed(4));
0.001
>>> parseFloat(0.0000009999999.toFixed(4));
0

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