Babel7 转码

https://segmentfault.com/a/1190000020237738

https://segmentfault.com/a/1190000020237779

https://segmentfault.com/a/1190000020237785

https://segmentfault.com/a/1190000020237790

https://segmentfault.com/a/1190000020237817

https://segmentfault.com/a/1190000020237923

https://segmentfault.com/a/1190000020237950

来源：https://www.cnblogs.com/answercard/p/11646057.html