Using the AJAX of JQUERY:
First of all you need the linked JQUERY library in your script like this:
<script src='jquery.js' type='text/javascript'></script>
Imagine you have this form in your index.php:
    <form>
        <input id="dado1" type="text">
        <input id="dado2" type="text">
        <input id="enviar" type="submit">
    </form>
When you click submit, ajax will send input values to the page armazenaDados.php
   <script>
    $('#enviar').on('click',function(){ 
        var dado1 = $('#dado1').val();
        var dado2 = $('#dado2').val();
        $.ajax({ 
            url: 'armazenaDados.php', 
            type: 'POST', 
            data: { dadoA: dado1, dadoB: dado2 },
            success: function(data) { 
               alert("alterado!"); 
            } 
        }); 
    });
</script>
In the archive armazenaDados.php you recover these values:
<?php
$dado1 = $_POST['dadoA'];
$dado2 = $_POST['dadoB'];
.... código que armazena os dados...
							
							
						 
You tried using jquery json?
– Andrei Coelho
I don’t know it like it is?
– Andressa Limão
I will formulate an example answer
– Andrei Coelho
I said Json, but it’s actually AJAX. Sleep is already beating...
– Andrei Coelho
Take a tour so you get better results in your questions. https://answall.com/help/mcve. takes advantage of this post to also https://pt.meta.stackoverflow.com/questions/1078/como-e-por-que-aceitar-uma-resposta/1079#1079
– user60252