JSFiddle - React, Tailwind, and code Playground

by Ranganadh Paramkusam

HTML

<script src="https://code.jquery.com/jquery.min.js"></script>
<button id="btn">
  Download
</button>

JavaScript

var base64_ranks = [62, 255, 255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 0, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255, 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51];
var decode_base64 = function(base64) {
  var len = base64.length,
    buffer = new Uint8Array(len / 4 * 3 | 0),
    i = 0,
    outptr = 0,
    last = [0, 0],
    state = 0,
    save = 0,
    rank, code, undef;
  while (len--) {
    code = base64.charCodeAt(i++);
    rank = base64_ranks[code - 43];
    if (rank !== 255 && rank !== undef) {
      last[1] = last[0];
      last[0] = code;
      save = (save << 6) | rank;
      state++;
      if (state === 4) {
        buffer[outptr++] = save >>> 16;
        if (last[1] !== 61) {
          buffer[outptr++] = save >>> 8;
        }
        if (last[0] !== 61) {
          buffer[outptr++] = save;
        }
        state = 0;
      }
    }
  }
  return buffer.buffer;
}


var data =...