如何让JQuery选择个别子菜单？

The Wordpress theme I'm building has a mobile navigation menu, and I've set it up so that a span button appears to the right hand side of every menu item that has children / subpages, as a means of allowing me to open and close the submenus. The only problem is that when I click one of the buttons, all of the submenus open instead of just the one I've clicked. Is there a way of setting the jQuery to single out the individual submenu I'm trying to open?The Wordpress theme I'm building has a mobile n