是否有Byte KB MB GB之间的转换的接口

function formatFileSize(bytes) { 
  const units = ['Bytes', "KB', 'MB', 'GB', 'TB"]; 
  let size = bytes; 
  let unitIndex = 0; 
  while (size >= 1024 && unitIndex < units.length - 1) { 
    size /= 1024; 
    unitIndex++; 
  } 
  // 保留两位小数, 四舍五入 
  size = Math.round(size * 100) / 100; 
  return size + units[unitIndex]； 
}
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