code: function dataURLToArrayBuffer(dataURL) {
    var base64 = dataURL.replace(REGEXP_DATA_URL_HEAD, '');
    var binary = atob(base64);
    var arrayBuffer = new ArrayBuffer(binary.length);
    var uint8 = new Uint8Array(arrayBuffer);
    forEach(uint8, function (value, i) {
      uint8[i] = binary.charCodeAt(i);
    });
    return arrayBuffer;
  }
docs: Transform Data URL to array buffer.
  @param {string} dataURL - The Data URL to transform.
  @returns {ArrayBuffer} The result array buffer.