什么是javascript中将字节转换为可读格式的最优雅方式

Question

我在stackoverflow上找到了一个非常优雅的'humanize'转换器,它没有使用任何循环.

有可能用javascript做同样的事情吗？(例如1024字节=> 1 kb)？

听起来很简单,我已经做了很多搜索

如果你想知道:Java版本

Answer 1

function byteCount (bytes, unit) {
  if (bytes < (unit = unit || 1000)) 
    return bytes + " B";
  var exp = Math.floor (Math.log (bytes) / Math.log (unit));
  var pre = ' ' +(unit === 1000 ? "kMGTPE" : "KMGTPE").charAt (exp - 1) + (unit === 1000 ? "" : "i") + 'B';
    return (bytes / Math.pow (unit, exp)).toFixed (1) + pre;
}

[ 0, 27, 999, 1000, 1023, 1024, 1728, 110592, 7077888, 
  452984832, 28991029248, 1855425871872, 9223372036854775807].forEach (
    function (v) { console.log (v, byteCount (v), byteCount (v, 1024)); });

/* Displays :    
0 "0 B" "0 B"
27 "27 B" "27 B"
999 "999 B" "999 B"
1000 "1.0 kB" "1000 B"
1023 "1.0 kB" "1023 B"
1024 "1.0 kB" "1.0 KiB"
1728 "1.7 kB" "1.7 KiB"
110592 "110.6 kB" "108.0 KiB"
7077888 "7.1 MB" "6.8 MiB"
452984832 "453.0 MB" "432.0 MiB"
28991029248 "29.0 GB" "27.0 GiB"
1855425871872 "1.9 TB" "1.7 TiB"
9223372036854776000 "9.2 EB" "8.0 EiB" */

请注意,Java版本结果表的错误显示为7.1 KB而不是7.1 MB