无法将数据从订单传递到打印表单 ajax

Question

完成订单后，我需要打印简单的收据，因此当重定向到打印页面时，它会成功重定向，但数据没有传递到打印页面，这是我的问题。我想我的网址有问题。我附上了迄今为止我尝试过的代码。

函数addProject((｛

var table_data = [];
$('#product_list tbody tr').each(function(row,tr)
{
var sub = {
'barcode' : $(tr).find('td:eq(1)').text(),
'pname' : $(tr).find('td:eq(2)').text(),
'pro_price' : $(tr).find('td:eq(3)').text(),
'qty' : $(tr).find('td:eq(4)').text(),
'total_cost' : $(tr).find('td:eq(5)').text(),
};
table_data.push(sub);
});
console.log(table_data);
$.ajax({
type : "POST",
url: "add_purchase.php", // add the data to add_purchase.php
dataType: 'JSON',
data: { data:table_data},
success: function (data) {
console.log(_data);

$('#save').prop('disabled', false);
$('#save').html('');
$('#save').append('Add');

var msg;

msg="Oreder Completed";
window.location.href = "print.php?" + data;

$.alert({
title: 'Success!',
content: msg,
type: 'green',
boxWidth: '400px',
theme: 'light',
useBootstrap: false,
autoClose: 'ok|2000'
});
isNew = true;
}

print.php

<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "upos";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
if ($_SERVER['REQUEST_METHOD'] == 'POST') {

echo  $relative_list = $_POST['data'];
echo  "Hi";

for($x = 0; $x < count($relative_list); $x++)
{
$barcode= $relative_list[$x]['barcode'];
$pro_pricee= $relative_list[$x]['pro_price'];
$qty= $relative_list[$x]['qty'];
$total= $relative_list[$x]['total_cost'];
}
}
?>
<div class="invoice-title" align="right">
Invoice   <b><?php echo  $barcode;   ?></b>
</div>

此处数据为未定义变量：条形码

Add_purchase.php

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$relative_list = $_POST['data'];
for($x = 0; $x < count($relative_list); $x++)
{
$stm = $conn->prepare("INSERT INTO purchase_item(prod_id,buyprice,qty,total)
VALUES (?,?,?,?,?)");
$stm->bind_param("issss",$last_id,$prod_id,$buyprice,$qty,$total);
$prod_id= $relative_list[$x]['barcode'];
$buyprice= $relative_list[$x]['pro_price'];
$qty= $relative_list[$x]['qty'];
$total= $relative_list[$x]['total_cost'];
if ($stm->execute()) {
echo 1;
} else {
echo $conn->error;
}
$stm->close();
}

}

Answer 1

像这样转换代码

window.location.href = "print.php?data=" + data;

并将$_POST转换为$_GET

if ($_SERVER['REQUEST_METHOD'] == 'GET') {
$relative_list = $_GET['data'];
}