Jquery post with problems accessing a php class

Question

I’m having trouble accessing a class via $.post from jquery. There is some internal error that is not shown in the console. If I instantiate the class via php, it works perfectly, just by jquery that does not return anything. I am using spl_autoload in index only.

Controllers/Funilcontroller.php

<?php

namespace Controllers;
use Models\Vendas;

class FunilController
{
  public function __construct()
  {
    $v = new Vendas;
    $vendas = $v->index();
    return $vendas
  }
}

Models/Sales.php

<?php

namespace Models;
use Models\Conexao;

class Vendas extends Conexao
{
  public function index()
  {
    return 'olá';
  }
}

index php.

<?php
spl_autoload_register(function( $class ) {require_once str_replace( '\\', DIRECTORY_SEPARATOR, $class ) . '.php';});
?>

(...)

<script>
$.post('Models/Vendas.php',
 {solicitar: true, tab:1, cpf: Cpf, data_ini: dataIni, data_fim: dataFim},
 function(data){
 $('#res1').empty().append(data);
}, 'json');
</script>

Answer 1

Apparently the error is in contenttype, tries to set as example

  $.ajax({
   type: "POST",
   url: "/url",
   dataType : "json", // <--tipo de retorno esperado
   contentType: "application/json", // <-- tipo de dado enviado
   data: {
     solicitar: true, 
     tab:1, 
     cpf: Cpf,  
     data_ini: dataIni, 
     data_fim: dataFim},
   contentType: "application/json"
   success()
})

dataType (default: Intelligent Guess (xml, json, script, or html)) font: Ajax

Restructure the return of your Backend to an Object json {msg:"Hello"}