Асинхронная загрузка скрипта - Общие вопросы

	public function addScript($url, $type = "text/javascript", $defer = false, $async = false)

public function addScript($url, $type = "text/javascript", $defer = false, $async = true)

if (!defined('JCOMMENTS_JS')) {
			include_once(JCOMMENTS_HELPERS . '/system.php');
			$document->addScript(JCommentsSystemPluginHelper::getCoreJS());
			define('JCOMMENTS_JS', 1);

			if (!defined('JOOMLATUNE_AJAX_JS')) {
				$document->addScript(JCommentsSystemPluginHelper::getAjaxJS());
				define('JOOMLATUNE_AJAX_JS', 1);

if (!defined('JCOMMENTS_JS')) {
			include_once(JCOMMENTS_HELPERS . '/system.php');
			$document->addScript(JCommentsSystemPluginHelper::getCoreJS(), "text/javascript", false, false);
			define('JCOMMENTS_JS', 1);

			if (!defined('JOOMLATUNE_AJAX_JS')) {
				$document->addScript(JCommentsSystemPluginHelper::getAjaxJS(), "text/javascript", false, false);
				define('JOOMLATUNE_AJAX_JS', 1);

$document->addScript(JCommentsSystemPluginHelper::getAjaxJS(), "text/javascript", false, false);

$document->addScript(JCommentsSystemPluginHelper::getAjaxJS(), $type = "text/javascript", $defer = false, $async = false);

$document->addScript(JCommentsSystemPluginHelper::getAjaxJS(), "text/javascript", false, false);
$document->addScript(JCommentsSystemPluginHelper::getAjaxJS(), $type = "text/javascript", $defer = false, $async = false);

var element = document.createElement('script');
element.src = '/my_path/script.js';
document.head.appendChild(element);

$path = $this->baseurl . '/templates/' . $this->template . '/';
// Add JavaScript Frameworks
$this->footerScript[$path . 'js/jquery-1.9.1.min.js'] = 1;
$this->footerScript[$path . 'js/bootstrap.min.js'] = 1;
$this->footerScript[$path . 'js/common.js'] = 10;

<?php
if (is_array($this->footerScript))
{
		$scriptHtml = '';
		asort($this->footerScript, SORT_NUMERIC);
		foreach (array_keys($this->footerScript) as $script):
				$scriptHtml .= '<script src="' . $script . '"></script>';
		endforeach;
		echo $scriptHtml;
}
?>
</body>

$doc = JFactory::getDocument();
$doc->footerScript[ 'myPath/myScript.js'] = 1;

Uncaught ReferenceError: jcomments is not defined

<script src="/components/com_jcomments/js/jcomments-v2.3.js?v=12" type="text/javascript" async></script>
<script src="/components/com_jcomments/libraries/joomlatune/ajax.js?v=4" type="text/javascript" async></script>

<script type="text/javascript">
<!--
var jcomments=new JComments(<?php echo $object_id;?>, '<?php echo $object_group; ?>','<?php echo $this->getVar('ajaxurl'); ?>');
jcomments.setList('comments-list');
//-->
</script>
<?php
			// Тут немного кода вывода разных блоков
?>
<script type="text/javascript">
<!--
jcomments.setAntiCache(<?php echo $aca;?>,<?php echo $acp;?>,<?php echo $acf;?>);
//-->
</script>

jcomments.setAntiCache(<?php echo $aca;?>,<?php echo $acp;?>,<?php echo $acf;?>);