this.js

  <script id='script-batch' type='text/javascript'>  
     (function(d){  
       var js = d.createElement('script'); js.async = true; js.defer = true;  
       js.src = 'https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js';  
       d.getElementsByTagName('head')[0].appendChild(js);  
     })(document);  
  </script>

function add_async_attribute($tag, $handle) {
    if ( 'my-js-handle' !== $handle )
        return $tag;
    return str_replace( ' src', ' async="async" src', $tag );
}
add_filter('script_loader_tag', 'add_async_attribute', 10, 2);

Note that if both are specified, defer attribute is ignored by browsers.