djok_uzb

document.querySelector('tbody').addEventListener('input', function() {
  const data = Array.from(
    this.children,
    tr => Array.from(tr.querySelectorAll('input'), input => input.value)
  );

  console.log(data);
});

document.querySelector('table').addEventListener('input', e => {
  const { map, flatMap } = Array.prototype;
  const data = flatMap.call(
    e.currentTarget.tBodies,
    tbody => map.call(
      tbody.rows,
      tr => map.call(tr.cells, td => td.lastElementChild.value)
    )
  );

  console.log(data);
});

// или

document.querySelector('table').addEventListener('input', function() {
  const numHeadRows = this.querySelectorAll('thead tr').length;
  const data = [];

  for (const input of this.querySelectorAll('tbody input')) {
    const td = input.parentNode;
    const iCol = td.cellIndex;
    const iRow = td.parentNode.rowIndex - numHeadRows;
    (data[iRow] ??= [])[iCol] = input.value;
  }

  console.log(data);
});