我用react和typescript就能做到。

export const FormatBytes = (bytes: number) => {
  const units = ['b', 'kb', 'mb', 'gb', 'tb'];

  let i = 0;

  for (i; bytes >= 1024 && i < 4; i++) {
    bytes /= 1024;
  }

  return `${bytes.toFixed(2)} ${units[i]}`;
};

function bytesToSize(bytes) { var sizes = ['B', 'K', 'M', 'G', 'T', 'P']; for (var i = 0; i < sizes.length; i++) { if (bytes <= 1024) { return bytes + ' ' + sizes[i]; } else { bytes = parseFloat(bytes / 1024).toFixed(2) } } return bytes + ' P'; } console.log(bytesToSize(234)); console.log(bytesToSize(2043)); console.log(bytesToSize(20433242)); console.log(bytesToSize(2043324243)); console.log(bytesToSize(2043324268233)); console.log(bytesToSize(2043324268233343));

这是一个坚实的有效的方法来转换字节。你唯一需要做的就是安装mathjs库进行精确的计算。复制粘贴即可。

import { multiply, divide, round } from "mathjs";

class Size {
  constructor(value, unit) {
    this.value = value;
    this.unit = unit.toUpperCase();
  }
}

async function byteToSize(bytes) {
  const B = 1;
  const KB = multiply(B, 1024);
  const MB = multiply(KB, 1024);
  const GB = multiply(MB, 1024);
  const TB = multiply(GB, 1024);
  const PB = multiply(TB, 1024);

  if (bytes <= KB) {
    // @returns BYTE

    const result = round(divide(bytes, B));
    const unit = `B`;

    return new Size(result, unit);
  }

  if (bytes <= MB) {
    // @returns KILOBYTE

    const result = round(divide(bytes, KB));
    const unit = `KB`;

    return new Size(result, unit);
  }

  if (bytes <= GB) {
    // @returns MEGABYTE

    const result = round(divide(bytes, MB));
    const unit = `MB`;

    return new Size(result, unit);
  }

  if (bytes <= TB) {
    // @returns GIGABYTE

    const result = round(divide(bytes, GB));
    const unit = `GB`;

    return new Size(result, unit);
  }

  if (bytes <= PB) {
    // @returns TERABYTE

    const result = divide(bytes, TB).toFixed(2);
    const unit = `TB`;

    return new Size(result, unit);
  }

  if (bytes >= PB) {
    // @returns PETABYTE

    const result = divide(bytes, PB).toFixed(2);
    const unit = `PB`;

    return new Size(result, unit);
  }
}

这个解决方案建立在以前的解决方案的基础上，但同时考虑了公制和二进制单位:

function formatBytes(bytes, decimals, binaryUnits) {
    if(bytes == 0) {
        return '0 Bytes';
    }
    var unitMultiple = (binaryUnits) ? 1024 : 1000; 
    var unitNames = (unitMultiple === 1024) ? // 1000 bytes in 1 Kilobyte (KB) or 1024 bytes for the binary version (KiB)
        ['Bytes', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB']: 
        ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
    var unitChanges = Math.floor(Math.log(bytes) / Math.log(unitMultiple));
    return parseFloat((bytes / Math.pow(unitMultiple, unitChanges)).toFixed(decimals || 0)) + ' ' + unitNames[unitChanges];
}

例子:

formatBytes(293489203947847, 1);    // 293.5 TB
formatBytes(1234, 0);   // 1 KB
formatBytes(4534634523453678343456, 2); // 4.53 ZB
formatBytes(4534634523453678343456, 2, true));  // 3.84 ZiB
formatBytes(4566744, 1);    // 4.6 MB
formatBytes(534, 0);    // 534 Bytes
formatBytes(273403407, 0);  // 273 MB

将字节格式化为最符合逻辑大小(KB、MB或GB)的实用程序方法。

Number.prototype.formatBytes = function() { var单位= ['B'， 'KB'， 'MB'， 'GB'， 'TB']， 字节= this， 我; For (i = 0;>= 1024 && I < 4;我+ +){ 字节/= 1024; ｝ return bytes.toFixed(2) + units[i]; ｝ 令a = 235678;/ /字节 console.log (a.formatBytes ());//结果为230.15KB

函数by睾丸(字节){ const sizes = ['Bytes'， 'KB'， 'MB'， 'GB'， 'TB']; If (bytes === 0)返回'n/a'; const i = Math.min(Math.floor(Math.log(bytes) / Math.log(1024)))，大小。长度- 1); 如果(i === 0)返回' ${bytes} ${sizes[i]} '; 返回“${(字节/(1024 * *我)).toFixed(1)} ${大小[我]}'; ｝ console.log (bytesToSize (400000)) console.log (bytesToSize (5000000))