Place scripts in footer instead of head in Joomla

You can use send any js script to footer.

Code :

 $doc->addScript($modulePath.'js/currency.js', array(), array("defer" => "defer"));

$options=array(
    "type"=>"text/javascript",
    "defer"=>true, 
    "async"=>false,
    "depends"=>array("jquery","jquery-ui"),
    "provides"=>"jquery-animation"
);
JFactory::getDocument()->addScript($url, $options);

Reference url : https://joomla.stackexchange.com/questions/371/adding-javascript-file-in-the-footer-custom-styles