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

问题描述

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：

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

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];
};

但是，这似乎不是100％准确。例如：

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

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

这不应该是1.5 GB？似乎1024的划分正在失去精度。我完全误解了某些东西，或者有更好的方法吗？

Shouldn't this be "1.5 GB"? It seems like the division by 1024 is losing precision. Am I totally misunderstanding something or is there a better way to do this?

推荐答案

这取决于你是否想要使用二进制文件或者十进制约定。

It depends on whether you want to use the binary or decimal convention.

RAM，例如，总是用二进制来衡量，所以要表达1551859712，因为~1.4GiB是正确的。

RAM, for instance, is always measured in binary, so to express 1551859712 as ~1.4GiB would be correct.

另一方面，硬盘制造商喜欢使用小数，因此他们会称之为~1.6GB。

On the other hand, hard disk manufacturers like to use decimal, so they would call it ~1.6GB.

只是令人困惑，软盘使用两个系统的混合 - 它们的1MB实际上是1024000字节。

And just to be confusing, floppy disks use a mixture of the two systems - their 1MB is actually 1024000 bytes.

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