从JavaScript发送多个值（文件）到PHP

I have this code

我有这个代码

var action = $("#action").val();
var z_product_id = $("#z_product_id").val(); 
var product_id = $("#product_id").val(); 
$.post('ajaxGetOperations.php',
    {action: action, z_product_id: z_product_id, product_id: product_id},
    function(data)
    {
        $('#respons').html(data);
        $('#hand_product_id').val(product_id);
    }) ;                                         
var action = $("#ac