WordPress at a glance
function is not described

export_add_js() WP 3.5.0

Display JavaScript on the page.

No Hooks.

Return

Nothing (null).

Usage

export_add_js();

Code of export add js: wp-admin/export.php WP 5.2.1

<?php
function export_add_js() {
	?>
<script type="text/javascript">
	jQuery(document).ready(function($){
		 var form = $('#export-filters'),
			 filters = form.find('.export-filters');
		 filters.hide();
		 form.find('input:radio').change(function() {
			filters.slideUp('fast');
			switch ( $(this).val() ) {
				case 'attachment': $('#attachment-filters').slideDown(); break;
				case 'posts': $('#post-filters').slideDown(); break;
				case 'pages': $('#page-filters').slideDown(); break;
			}
		 });
	});
</script>
	<?php
}