<?php

/**
 * Our theme/plugin enqueue scripts function.
 */
function example_enqueue_scripts() {
	
	// Register the script in the normal WordPress way.
	wp_register_script( 'example-shortcode-js', '...example-shortcode-script.js' );
	// filemtime( dirname( __FILE__ )
	// Grab the global $post object.
	global $post;
	
	// See if the post HAS content and, if so, see if it has our shorcode.
	if ( isset( $post->post_content ) && has_shortcode( $post->post_content, 'example_shortcode' ) ) {
		wp_enqueue_script( 'example-shortcode-js' );
	}
}
add_action( 'wp_enqueue_scripts', 'example_enqueue_scripts' );

/**
 * Our Custom Shortcode.
 */
function example_shortcode_function(){
	return 'Hello World!';
}
add_shortcode( 'example_shortcode', 'example_shortcode_function' );