<table>
<tbody><tr class="heading">
    <td>№</td>
    <td>ID склада</td>
    <td>Название</td>
    <td>Адрес</td>
    <td>Количество товара</td>    </tr>
  <tr>
    <td style="text-align:center;"><a href="/bitrix/admin/cat_store_edit.php?ID=4&amp;lang=ru">1</a></td>
    <td style="text-align:center;">4</td>
    <td style="text-align:center;">Главный склад</td>
    <td style="text-align:center;">Сочи</td>
    <td style="text-align:center;"><input type="text" id="AR_AMOUNT_4" name="AR_AMOUNT[4]" size="12" value="66"><input type="hidden" name="AR_STORE_ID[4]" value="4"></td></tr><tr>
    <td style="text-align:center;"><a href="/bitrix/admin/cat_store_edit.php?ID=5&amp;lang=ru">2</a></td>
    <td style="text-align:center;">5</td>
    <td style="text-align:center;">ДляСайта</td>
    <td style="text-align:center;"><a href="/bitrix/admin/cat_store_edit.php?ID=5&amp;lang=ru">(изменить)</a></td>
    <td style="text-align:center;"><input type="text" id="AR_AMOUNT_5" name="AR_AMOUNT[5]" size="12" value="77"><input type="hidden" name="AR_STORE_ID[5]" value="5"></td></tr><tr>
    <td style="text-align:center;"><a href="/bitrix/admin/cat_store_edit.php?ID=6&amp;lang=ru">3</a></td>
    <td style="text-align:center;">6</td>
    <td style="text-align:center;">Склад Во</td>
    <td style="text-align:center;">Во</td>
    <td style="text-align:center;"><input type="text" id="AR_AMOUNT_6" name="AR_AMOUNT[6]" size="12" value="22"><input type="hidden" name="AR_STORE_ID[6]" value="6"></td></tr><tr>
    <td style="text-align:center;"><a href="/bitrix/admin/cat_store_edit.php?ID=7&amp;lang=ru">4</a></td>
    <td style="text-align:center;">7</td>
    <td style="text-align:center;">Импорт77</td>
    <td style="text-align:center;"><a href="/bitrix/admin/cat_store_edit.php?ID=7&amp;lang=ru">(изменить)</a></td>
    <td style="text-align:center;"><input type="text" id="AR_AMOUNT_7" name="AR_AMOUNT[7]" size="12" value="44"><input type="hidden" name="AR_STORE_ID[7]" value="7"></td></tr>
</tbody></table>
<div id="alla"></div>

const alla = [...document.querySelectorAll('[name^=AR_AMOUNT]')]
.map(el => +el.value);
console.log(alla);

document.getElementById('alla').innerText = JSON.stringify(alla);