使用第三方开发的模块，下载地址如下：
https://github.com/mageprince/magento2-buynow
Magento 2 BuyNow
This module add “BuyNow” button on product view page to process directly checkout.
Installation Instruction
Copy the content of the repo to the Magento 2 root folder
Run command:
php bin/magento setup:upgradeRun Command:
php bin/magento setup:static-content:deployNow Flush Cache: php bin/magento cache:flush
PRODUCT VIEW PAGE
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