二进制人类可读到实际大小

Question

我想将人类可读大小（例如“10Mi”）转换回实数大小

我写了以下内容，但我似乎在转换中遗漏了一些东西

function humanFileSizeToSize (sizeString) {
    const units = ['Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi', 'Yi'];
    const unitString = units.find(unit => sizeString.includes(unit));
    const power = units.indexOf(unitString) + 1;
    const size = parseFloat(sizeString.slice(0, sizeString.indexOf(unitString)))
    return parseInt(size * (1024**power));
}

console.log(humanFileSizeToSize("10Mi"))
console.log(humanFileSizeToSize("1.5Mi"))

Answer 1

假设 1 MiB 等于 1048576 字节，似乎按预期工作。

不过可以缩短，并且无需库即可完成

const units = [, 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi', 'Yi'];
const re = /(\d+(?:\.\d+)?)([KMGTPEZYi]{2})/g;
const humanFileSizeToSize = sizeString => {
  const [[_,size,unit]] = sizeString.matchAll(re);
  const power = units.indexOf(unit)
  return parseInt(size * (1024 ** power));
}

console.log(humanFileSizeToSize("1Ki"))
console.log(humanFileSizeToSize("1Mi"))
console.log(humanFileSizeToSize("1.5Mi"))
console.log(humanFileSizeToSize("10Mi"))
console.log(humanFileSizeToSize("1Gi"))

二进制人类可读到实际大小

Binary Human Readable to Real Size

javascript

byte

filesize