正在查看the WordPress source code, 我可以这么说wp_ajax_nopriv_* 仅在您未登录时激发，并且wp_ajax_* 否则会引发火灾。

以下是相关位，在admin-ajax.php, 版本5.0.3中的第85-115行：

if ( is_user_logged_in() ) {
    // If no action is registered, return a Bad Request response.
    if ( ! has_action( \'wp_ajax_\' . $_REQUEST[\'action\'] ) ) {
        wp_die( \'0\', 400 );
    }

    /**
     * Fires authenticated Ajax actions for logged-in users.
     *
     * The dynamic portion of the hook name, `$_REQUEST[\'action\']`,
     * refers to the name of the Ajax action callback being fired.
     *
     * @since 2.1.0
     */
    do_action( \'wp_ajax_\' . $_REQUEST[\'action\'] );
} else {
    // If no action is registered, return a Bad Request response.
    if ( ! has_action( \'wp_ajax_nopriv_\' . $_REQUEST[\'action\'] ) ) {
        wp_die( \'0\', 400 );
    }

    /**
     * Fires non-authenticated Ajax actions for logged-out users.
     *
     * The dynamic portion of the hook name, `$_REQUEST[\'action\']`,
     * refers to the name of the Ajax action callback being fired.
     *
     * @since 2.8.0
     */
    do_action( \'wp_ajax_nopriv_\' . $_REQUEST[\'action\'] );
}

如果无论用户是否登录，都希望运行相同的操作，我建议您both wp_ajax_* 和wp_ajax_nopriv_*.