我将为您提供一种不同的方法，无需实际编辑模板文件。您只需将这两个动作挂钩添加到function.php 文件（确保使用child theme):

/**
 * This will add a \'Show All\' link after the pagination on the shop pages.
 * It will be hidden once it is activated.
 */
add_action( \'woocommerce_after_shop_loop\', \'wpse333192_add_showall\', 40 );

function wpse333192_add_showall() {

    if ( ! isset( $_GET[\'showall\'] ) ) {
        global $wp;

        echo sprintf(
            "<a href=\'%s\'>%s</a>",
            home_url( add_query_arg( array_merge( $_GET, [ \'showall\' => 1 ] ), $wp->request ) ),
            __( \'Show All\', \'text-domain\' )
        );
    }

}

/**
 * This will alter the main product query if \'showall\' is activated
 */
add_action( \'pre_get_posts\', \'wpse333192_alter_query_showall\' );

function wpse333192_alter_query_showall( $query ) {

    /**
     * Alter the query only if it is:
     * 1. The main query
     * 2. Post type is product
     * 3. $_GET[\'showall\'] is set
     * 4. $_GET[\'showall\'] equals 1
     */
    if ( $query->is_main_query()
         && $query->get( \'post_type\' ) == \'product\'
         && isset( $_GET[\'showall\'] )
         && $_GET[\'showall\'] == 1
    ) {
        // Load the \'first\' page
        $query->set( \'paged\', 1 );

        // Set post per page to unlimited
        $query->set( \'posts_per_page\', - 1 );
    }

    return $query;
}

Put below code after 此操作<?php do_action(\'woocommerce_after_shop_loop\' ); ?> 在里面archive-product.php 文件

For Category Products Page

<?php
$cat_data = get_queried_object();
$cat_id = $cat_data->term_id;
if(is_product_category()  && !isset($_GET[\'showall\'])){ ?>
    <a href="<?php echo get_term_link( $cat_id, \'product_cat\' ) . "?showall=1"; ?>">Show all</a>
<?php } ?>

For Shop Page

<?php if(is_shop() && !isset($_GET[\'showall\'])){ ?>
    <a href="<?php echo get_permalink( woocommerce_get_page_id( \'shop\' ) ) . "?showall=1"; ?>">Show all</a>
<?php } ?>

if(isset( $_GET[\'showall\']) ){ 
    add_filter( \'loop_shop_per_page\', create_function( \'$cols\', \'return -1;\' ) ); 
} else {
    $default_posts_per_page = get_option( \'posts_per_page\' );
    add_filter( \'loop_shop_per_page\', create_function( \'$cols\', \'return \'.$default_posts_per_page.\';\' ) );
}

create\\u function（）已弃用。您应该使用以下代码来获得所需的结果。

  add_filter( \'loop_shop_per_page\', \'show_all\' ); 
function show_all($cols){
    if(isset( $_GET[\'showall\']) ){ 
    
    return $cols = -1;
} else {
    $default_posts_per_page = get_option( \'posts_per_page\' );
    return $default_posts_per_page;
}
}