How can I include properly javascript files in my wp plugin [duplicate]

you can use
plugin_dir_url(FILE)
function to get the path of your js file. And enqueue script like this:-

    add_action('wp_enqueue_scripts','ir_jscripts');
   function ir_jscripts()
   {
       wp_enqueue_script( 'myscript',plugin_dir_url(__FILE__).'/jquery/script.js', array(), '3.3.5', true );

   }

Thanks