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How do I use AJAX, Javascript and PHP to POST data AND a file?

I can post the data inputs "name" and "lname", but not the file "myfile".

I have a input page called "input.php" and a post page called "postit.php".

input.php

My html:

<form method="post" name="form" action="postit.php" enctype="multipart/form-data">
 <input type="text" name="name" id="name" placeholder="Name" >
 <input type="text" name="lname" id="lname" placeholder="lname">
 <input type="file" name="myfile" id="myfile" placeholder="myfile">

 <button type="button" onclick="myFunction()">Save</button><br>
</form>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

My Javascript:

function myFunction() 
 var name = document.getElementById("name").value;
 var lname = document.getElementById("lname").value;
 var myfile = document.getElementById("myfile").value;
 $.ajax(
 type : "POST",
 url : "postit.php",
 data : name : name, lname : lname, myfile: myfile ,
 success: function(res) 
 setTimeout(function () location.reload(), 400);
 
 );

postit.php

<?php 
$name = $_POST['name']; 
$lname = $_POST['lname']; 
$myfile = $_FILES['myfile']['name'];
?>