How to execute such function on click of checkboxes?

Question

JavaScript

Greetings, tell me how to register to perform this function only not by the button id, but by clicking on each checkbox on the page?

js jquery

$(document).on('click', '#button', function(){
  let txt = document.getElementById("keyPrivHex").value;
  $.ajax({
    url: 'test.php',
    type: 'POST',
    data: { txt: txt, },
    success: function(data){
     $('p.out').text(data);
   },
    error: function(){
  console.log('ERROR');
    }
 })
})

or in this way:

document.querySelectorAll("input[type='checkbox']").forEach(item=>{
item.addEventListener('click', func)

Answer 1

$(document).on('click', "input[type='checkbox']", function(){