购买后，WooCommerce不会重定向到内部链接

I want to redirect to custom page after purchase on woocommerce code below:

add_action( 'template_redirect', 'wc_custom_redirect_after_purchase' );
function wc_custom_redirect_after_purchase() {
   global $wp;

   if ( is_checkout() && ! empty( $wp->query_vars['order-received'] ) ) {
        wp_redirect( get_page_by_title( About )->ID );
        exit;
    }
} 

It redirects to 'order-received' page which does not exist.

You have forgot th little "" around the title and you should need to use get_permalink() function too this way:

add_action( 'template_redirect', 'wc_custom_redirect_after_purchase' );
function wc_custom_redirect_after_purchase() {
   global $wp;

   if ( is_checkout() && ! empty( $wp->query_vars['order-received'] ) ) {
        wp_redirect( get_permalink( get_page_by_title( "About" )->ID ) );
        exit;
    }
} 

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

I have tested it and this should work now