Update the core jQuery version that ships with WordPress

You can replace the default version that ships with WordPress like that:

function replace_core_jquery_version() {
   function replace_core_jquery_version() {
    wp_deregister_script( 'jquery-core' );
    wp_register_script( 'jquery-core', "https://code.jquery.com/jquery-3.4.1.min.js", array(), '3.4.1' );
    wp_deregister_script( 'jquery-migrate' );
    wp_register_script( 'jquery-migrate', "https://code.jquery.com/jquery-migrate-3.1.0.js", array(), '3.1.0' );
add_action( 'wp_enqueue_scripts', 'replace_core_jquery_version' );

Load a script after a web page is loaded

So I was writing an A/B testing and was looking for the default jQuery method for loading an external script. So using the jQuery.getScript, you can do exactly that; load a script after a web page is already loaded and perform actions once it is loaded into DOM.

[codepen_embed height=”353″ theme_id=”light” slug_hash=”qoBXxW” default_tab=”js,result” user=”fahdi” preview=”true” data-preview=”true”]See the Pen jQuery.getScript demo by Fahad Murtaza (@fahdi) on CodePen.[/codepen_embed]