如何在Javascript中舍入一个数字？ [英] How to round up a number in Javascript?

问题描述

我想使用Javascript来舍入一个数字。由于这个数字是货币，我希望它像这些例子一样向上舍入（2个小数点）：

I want to use Javascript to round up a number. Since the number is currency, I want it to round up like in these examples (2 decimal points):

• 192.168 => 192.20


• 192.11 => 192.20


• 192.21 => 192.30


• 192.26 => 192.30


• 192.20 => 192.20

• 192.168 => 192.20
• 192.11 => 192.20
• 192.21 => 192.30
• 192.26 => 192.30
• 192.20 => 192.20

如何使用Javascript实现这一目标？内置的Javascript函数将根据标准逻辑（小于和大于5）向上舍入数字。

How to achieve this using Javascript? The built-in Javascript function will round up the number based on standard logic (less and more than 5 to round up).

推荐答案

/**
 * @param num The number to round
 * @param precision The number of decimal places to preserve
 */
function roundUp(num, precision) {
  precision = Math.pow(10, precision)
  return Math.ceil(num * precision) / precision
}

roundUp(192.168, 1) //=> 192.2

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