使用 1.5K、1M、1G 等公制前缀格式化 javascript 数字

问题描述

我想使用 Metric Prefix 显示数字，其中包含 3 个有效数字，如下所示:

I want to display numbers using a Metric Prefix with 3 significant digits like so:

1 shows as 1
999 shows as 999
1000 shows as 1K
999000 shows as 999K
1000000 shows as 1M
1500000 shows as 1.5M
1000000000 shows as 1G
etc...

我可以编写自己的 javascript 函数来执行此操作，但我想知道是否有一种标准的方式来格式化这样的数字?

I could write my own javascript function to do this but I was wondering if there is a standard way of formatting numbers like this?

推荐答案

您可以将范围放在对象数组中，然后循环遍历它以格式化数字:

You can put the ranges in an array of objects, and just loop through it to format the number:

var ranges = [
  { divider: 1e18 , suffix: 'E' },
  { divider: 1e15 , suffix: 'P' },
  { divider: 1e12 , suffix: 'T' },
  { divider: 1e9 , suffix: 'G' },
  { divider: 1e6 , suffix: 'M' },
  { divider: 1e3 , suffix: 'k' }
];

function formatNumber(n) {
  for (var i = 0; i < ranges.length; i++) {
    if (n >= ranges[i].divider) {
      return (n / ranges[i].divider).toString() + ranges[i].suffix;
    }
  }
  return n.toString();
}

使用示例:

var s = formatNumber(999000);

要处理负数，您可以先在函数中添加:

To also handle negative numbers, you would add this first in the function:

  if (n < 0) {
    return '-' + formatNumber(-n);
  }

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