The js implementation converts bytes to normal units (KB, MB)

The size of the file obtained from the file server is in bytes (bat), so I found a method to convert

function getfilesize(size) {// Convert bytes to normal file size
  if(! size)return "";
  var num = 1024.00; //byte
  if (size < num)
      return size + "B";
  if (size < Math.pow(num, 2))
      return (size / num).toFixed(2) + "KB"; //kb
  if (size < Math.pow(num, 3))
      return (size / Math.pow(num, 2)).toFixed(2) + "MB"; //M
  if (size < Math.pow(num, 4))
      return (size / Math.pow(num, 3)).toFixed(2) + "G"; //G
  return (size / Math.pow(num, 4)).toFixed(2) + "T"; //T
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