Custom add to cart button to add multiple product into cart with quantity :woocommerce

Question

I want to create custom add to cart button to add my 3 product into cart with 2 quantity for each..

For add three product into cart I have done using like this:

Answer 1

Save products id in array and make ajax request

 jQuery("#addSelected").click(function() {  var arrayLength =
 arrayOfAddedProducts.length;   jQuery.ajax({
         type: "POST",
         url: ajaxurl,
         data: {action : 'add_item_from_cart','getIDtoAdd' : arrayOfAddedProducts},
         success: function (res) {
            wc_load_all_products();
         }
     }); });

function.php

function add_item_from_cart() {
   foreach ($_POST['getIDtoAdd'] as $productId) {
      WC()->cart->add_to_cart( intval($productId), 1, 0, array(), array() );
    // WC()->cart->add_to_cart( $product_id = 0, $quantity = 1, $variation_id = 0, $variation = array(), $cart_item_data = array() );
   }
}

add_action('wp_ajax_add_item_from_cart', 'add_item_from_cart');
add_action('wp_ajax_nopriv_add_item_from_cart', 'add_item_from_cart');