1、判断代码

<?php
/**
 * Created by PhpStorm.
 * User: 秋枫雁飞
 * Date: 2019/9/20
 * Time: 18:13
 * Copyright © 2016 Aiweline. All rights reserved.
 * See COPYING.txt for license details.
 */
//url
$login_url = $this->getUrl('customer/account/login');
$account_url = $this->getUrl('customer/account/');
//获取sessionb
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$customerSession = $objectManager->get('Magento\Customer\Model\Session');
//判断登录
if ($customerSession->isLoggedIn()):
    echo "<a href='$account_url'>My Account</a>";
else:
    echo "<a href='$login_url'>Login</a>";
endif;
?>