javascript - 将文件大小以字节为单位转换为人类可读的字符串(Converting file size in bytes to human-readable string)

Question

I'm using this function to convert a file size in bytes to a human-readable file size:

(我正在使用此函数将文件大小（以字节为单位）转换为人类可读的文件大小：)

function getReadableFileSizeString(fileSizeInBytes) {
    var i = -1;
    var byteUnits = [' kB', ' MB', ' GB', ' TB', 'PB', 'EB', 'ZB', 'YB'];
    do {
        fileSizeInBytes = fileSizeInBytes / 1024;
        i++;
    } while (fileSizeInBytes > 1024);

    return Math.max(fileSizeInBytes, 0.1).toFixed(1) + byteUnits[i];
};

However, it seems like this isn't 100% accurate.

(但是，似乎这并非100％准确。)

For example:

(例如：)

getReadableFileSizeString(1551859712); // output is "1.4 GB"

Shouldn't this be "1.5 GB" ?

(这不应该是"1.5 GB"吗？)

It seems like the division by 1024 is losing precision.

(似乎1024的划分正在失去精度。)

Am I totally misunderstanding something or is there a better way to do this?

(我完全误解了某些东西，还是有更好的方法来做到这一点？)

  ask by Hristo translate from so

Answer 1

Here's one I wrote:

(这是我写的一个：)

function humanFileSize(bytes, si) {
    var thresh = si ? 1000 : 1024;
    if(Math.abs(bytes) < thresh) {
        return bytes + ' B';
    }
    var units = si
        ? ['kB','MB','GB','TB','PB','EB','ZB','YB']
        : ['KiB','MiB','GiB','TiB','PiB','EiB','ZiB','YiB'];
    var u = -1;
    do {
        bytes /= thresh;
        ++u;
    } while(Math.abs(bytes) >= thresh && u < units.length - 1);
    return bytes.toFixed(1)+' '+units[u];
}

eg

(例如)

humanFileSize(5000,true)
> "5.0 kB"
humanFileSize(5000,false)
> "4.9 KiB"
humanFileSize(-10000000000000000000000000000)
> "-8271.8 YiB"