Magento -当结帐页面打开时，我如何运行函数？

<?php
namespace YourNamespace\YourModule\Observer;

use Magento\Framework\Event\ObserverInterface;

class CheckoutPageLoadObserver implements ObserverInterface
{
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        // 在这里编写您想要运行的函数的代码
    }
}

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="checkout_onepage_controller_success_action">
        <observer name="your_observer_name" instance="YourNamespace\YourModule\Observer\CheckoutPageLoadObserver" />
    </event>
</config>