Magento 2检查客户是否注册？

$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of object manager
$customer_check = $objectManager->get('Magento\Customer\Model\Customer');
$customer_check->setWebsiteId($website_id);
$customer_check->load('CUSTOMER_ID');

if ( $customer_check->getId() ) {
      // the customer already exist
} else {
      // does not exist
}