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The following will, on a single product page, replace the "Add to Cart" button with a custom text message if the cart is not empty:

// 添加到購(gòu)物車替換文本消息
function add_to_cart_replacement(){
    // 您的消息文本
    $message_text = __( "在您可以將另一個(gè)產(chǎn)品添加到購(gòu)物車之前，請(qǐng)完成購(gòu)買或清空購(gòu)物車。", "woocommerce" );
    
    // 顯示文本消息
    echo '<p class="button message">' . $message_text . '</p>';
}
// 用自定義文本消息替換單個(gè)產(chǎn)品的添加到購(gòu)物車按鈕
add_action( 'woocommerce_single_product_summary', 'replace_single_add_to_cart_button', 1 );
function replace_single_add_to_cart_button() {
    global $product;
    
    // 如果購(gòu)物車不為空
    if( ! WC()->cart->is_empty() ){
        // 對(duì)于變量產(chǎn)品類型（保留屬性選擇字段）
        if( $product->is_type( 'variable' ) ) {
            remove_action( 'woocommerce_single_variation', 'woocommerce_single_variation_add_to_cart_button', 20 );
            add_action( 'woocommerce_single_variation', 'add_to_cart_replacement', 20 );
        }
        // 對(duì)于其他所有產(chǎn)品類型
        else {
            remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_add_to_cart', 30 );
            add_action( 'woocommerce_single_product_summary', 'add_to_cart_replacement', 30 );
        }
    }
}

The code is placed in your child theme’s functions.php file (or in a plugin). Tested and available.

You will get results similar to: