A/B test
https://en.wikipedia.org/wiki/A/B_testing
A/B testing (bucket tests or split-run testing) is a randomized experiment with two variants,
A / B测试（桶测试或分离测试）是一个随机实验，有两个变体，
ref
https://code.fb.com/android/react-native-bringing-modern-web-techniques-to-mobile/
什么是 A/B 测试
https://www.zhihu.com/question/20045543
https://ab.testin.cn/
https://unbounce.com/landing-page-articles/what-is-ab-testing/