ajax将带有数据的数组发送到输入

Question

我有一个表单，可以获取检查框及其相应的输入数字，当我单击表单的按钮时，我使用javascript收集了文档的所有值，但没有将脚本的值传递给ajax并转到php帮助表。

表格：

<div class="form-check">
                              <input class="form-check-input" name="ingrediente" type="checkbox" id="ing$id" value="$id">
                              <label class="form-check-label" for="ing$id">" . utf8_encode($ingrediente) . "</label>
                            </div>
                            <div class="quiantitynice" id="quiantitynice$id" style='position:relative;display:none'>
                            <input type=\"number\" name=\"quantity\" id="quiantitynice$id" min="1" value="" Style="width:45Px" placeholder="1">
                            </div>
 <script>
$(document).ready(function(){
 $('[name="ingrediente"]').on('change',function () { 
  var _thisVal = $(this).val();
  if (this.checked) {
   $("#quiantitynice" + _thisVal).show();
   } else {
    $("#quiantitynice" + _thisVal).hide();
    }
  });
});

<button class="btn btn-lg btn-wy" onclick="addcarto('');">AGREGAR</button>

编码到javascript文件中按钮功能的位置：

function addcarto() {
var extra = "";
var extras = ["NINGUNO"];
//Cantidad
var amount = "";
var quantity = document.getElementsByName("quantity");
//Cantidad
var chkbExtras = document.getElementsByName("ingrediente");
for (i = 0; i < chkbExtras.length; i++) {
    if (chkbExtras[i].checked) {
        extra = chkbExtras[i].value;
        extras[i] = extra;
        //cantidad
        amount = quantity[i].value;
        quantities[i] = amount;
        //cantidad
    }
}
var valParam = JSON.stringify(extras);
var valParam2 = JSON.stringify(quantities);
$.ajax({
    type: 'post',
    url: 'php/addCart2.php',
    //data: 'cantidades=' + quantities + '&opcion=' + 'nuevo' + '&extras=' + extras,
    data: { cantidades: valParam, extras: valParam2},
    contentType: 'application/json; charset=utf-8',
    success: function (response) {
        //document.getElementById('btnPedir').innerHTML = "<img src='img/icono-pedido0.png' width='40'><span class='badge badge-pill badge-danger'>" + data + "</span>";
        alert(response.status);
    },
    error: function () {
        alert("error");
    }
});
return false;}

从ajax接收数据的文件代码：

the code of the file to recive data from ajax: