How can I get the nested select box value using jQuery

Here's my shopping cart that I want to get the quantity value if its changed with jQuery. How do I get the quantity value with jQuery as this is an array of products?

@foreach($carts as $cart)
    <tr>
        <td class="cart_product col-sm-1">
            <img src="" class="img-responsive" alt="">
        </td>
        <td class="cart_description">
            <p></p>
        </td>
        <td class="cart_price">
            <p>Rs. </p>
        </td>
        <td class="cart_quantity">
            <div class="cart_quantity_button">

                <select class="cart_quantity"  name="quantity[]" data-class="">
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
                    <option value="5">5</option>
                    <option value="6">6</option>
                    <option value="7">7</option>
                    <option value="8">8</option>
                    <option value="9">9</option>
                    <option value="10">10</option>
                </select>

            </div>

        </td>
        <td class="cart_total">
            <p class="cart_total_price">Rs. </p>
            <?php $total_price+=$item_price ?>
        </td>
        <td class="cart_delete">
            <a class="cart_quantity_update" data-class=""><i class="fa fa-refresh"></i></a>
        </td>
        <td class="cart_delete">
            <a class="cart_quantity_delete" data-class=""><i class="fa fa-times"></i></a>
        </td>
    </tr>
@endforeach

via jawad ali