wordpress wp_nav_menu

Why I can't add an id or a class in the output of wp_nav_menu?

here is my code:

wp_nav_menu( array( 'container_id' => 'navigation', 'container_class' => 'menu' ) );

开发者_JS百科

nothing happens on this.

I already added it to registered items in functions.php

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Are you using the WP Super Cache plugin? You will need to turn it off while you are changing/developing things. Also, some themes don't always support menus in the way you might expect.