Drop-Down Navigation: Responsive and Touch-Friendly (moseover, hover) https://osvaldas.info/drop-down-navigation-responsive-and-touch-friendly

doubleTapToGo.js

/*
	By Osvaldas Valutis, www.osvaldas.info
	Available for use under the MIT License
*/
;(function( $, window, document, undefined ) {
	$.fn.doubleTapToGo = function( params )	{
		
		if( !( 'ontouchstart' in window ) &&
			!navigator.msMaxTouchPoints &&
			!navigator.userAgent.toLowerCase().match( /windows phone os 7/i ) ) return false;

		this.each( function() {
			var curItem = false;

			$( this ).on( 'click', function( e )
			{
				var item = $( this );
				if( item[ 0 ] != curItem[ 0 ] )
				{
					e.preventDefault();
					curItem = item;
				}
			});

			$( document ).on( 'click touchstart MSPointerDown', function( e ) {
				var resetItem = true,
					parents	  = $( e.target ).parents();

				for( var i = 0; i < parents.length; i++ )
					if( parents[ i ] == curItem[ 0 ] )
						resetItem = false;

				if( resetItem )
					curItem = false;
			});
		});
		return this;
	};
})( jQuery, window, document );

doubleTapToGo_init.js

/* WP */
$(function () {
    $('.touch #navi .menu-item-has-children > a').not('.sub-menu a').doubleTapToGo();
});