How can to locate all selected checkboxes by using the jQuery selector? code example

Example 1: select all checkboxes jquery

$('input:checkbox').prop('checked', true);

Example 2: select all checkbox jquery

$('#select_all').change(function() {
  var checkboxes = $(this).closest('form').find(':checkbox');
  checkboxes.prop('checked', $(this).is(':checked'));
});